domingo, 30 de abril de 2017

Astronomy picture of the day - 2017 April 30 - Cassini Looks Out from Saturn

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Cassini Looks Out from Saturn 
Image Credit: NASAJPL-CaltechSpace Science Institute
Explanation: This is what Saturn looks like from inside the rings. Last week, for the first time, NASA directed the Cassini spacecraft to swoop between Saturn and its rings. During the dive, the robotic spacecraft took hundreds of images showing unprecedented detail for structures in Saturn's atmosphere. Looking back out, however, the spacecraft was also able to capture impressive vistas. In the featured image taken a few hours before closest approach,Saturn's unusual northern hexagon is seen surrounding the North Pole. Saturn's C ring is the closest visible, while the dark Cassini Division separates the inner B ring from the outer A. A close inspection will find the two small moons thatshepherd the F-ring, the farthest ring discernable. This image is raw and will be officially verified, calibrated and released at a later date. Cassini remains on schedule to end its mission by plunging into Saturn's atmosphere on September 15.

sábado, 29 de abril de 2017

Astronomy picture of the day - 2017 April 29 - Arches of Spring

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Arches of Spring 
Image Credit & Copyright: Ondrej Kralik

Explanation: Two luminous arches stretched across the dome of the sky on this northern spring night. After sunset on March 29, the mountain view panorama was captured in 57 exposures from Chopok peak in central Slovakia at an altitude of about 2,000 meters. The arc of the northern Milky Way is visible toward the right, but only after it reaches above the terrestrial lights from the mountain top perspective. Though dusk has passed, a bright patch of celestial light still hovers near the horizon and fades into a second luminous arch of Zodiacal Light, crossing near the center of the Milky Way. Dust in the ecliptic plane reflects sunlight to create the Zodiacal glow, typically prominent after sunset in clear, dark, skies of the northern spring. Almost opposite the Sun, Jupiter shines brightly near the horizon toward the left. Since Jupiter lies near the ecliptic, it appears within the slight brightening of the Zodiacal band also opposite the Sun called the Gegenschein.

sexta-feira, 28 de abril de 2017

Astromy picture of the day - 2017 April 28 - Exploring the Antennae

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Exploring the Antennae 
Image Credit & Copyright: Data; Subaru, NAOJNASA/ESA/Hubble - Assembly and Processing; Roberto Colombari

Explanation: Some 60 million light-years away in the southerly constellation Corvus, two large galaxies are colliding. Stars in the two galaxies, cataloged as NGC 4038 and NGC 4039, very rarely collide in the course of theponderous cataclysm that lasts for hundreds of millions of years. But the galaxies' large clouds of molecular gas and dust often do, triggering furious episodes of star formation near the center of the cosmic wreckage. Spanning over 500 thousand light-years, this stunning view also reveals new star clusters and matter flung far from the scene of the accident by gravitational tidal forces. The remarkable mosaicked image was constructed using data from the ground-based Subaru telescope to bring out large-scale and faint tidal streams, and Hubble Space Telescope data of extreme detail in the bright cores. The suggestive visual appearance of the extended arcing structures gives the galaxy pair its popular name - The Antennae.

quinta-feira, 27 de abril de 2017

Fotos - "Barreiro antigo" (Portugal)

"Barreiro antigo"

Astronomy picture of the day - 2017 April 27 - Lyrids in Southern Skies

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Lyrids in Southern Skies 
Image Credit & CopyrightYuri Beletsky (Carnegie Las Campanas ObservatoryTWAN)
Explanation: Earth's annual Lyrid meteor shower peaked before dawn on April 22nd, as our fair planet plowed through dust from the tail of long-period comet Thatcher. Seen from the high, dark, and dry Atacama desert a waning crescent Moon and brilliant Venus join Lyrid meteor streaks in this composited view. Captured over 5 hours on the night of April 21/22, the meteors stream away from the shower's radiant, a point not very far on the sky from Vega,alpha star of the constellation Lyra. The radiant effect is due to perspective as the parallel meteor tracks appear to converge in the distance. In the foreground are domes of the Las Campanas Observatory housing (left to right) the 2.5 meter du Pont Telescope and the 1.3 meter Optical Gravitational Lensing Experiment (OGLE) telescope.

quarta-feira, 26 de abril de 2017

Imagens - Desertos curiosos do Mundo - Khongoryn Els en Mongolia.

Desiertos curiosos
Khongoryn Els en Mongolia.

Fotos - Barreiro antigo (Portugal)

"Barreiro antigo"


Astronomy picture of the day - 2017 April 26 - Mt. Etna Lava Plume

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Mt. Etna Lava Plume 
Image Credit & Copyright: Dario Giannobile
Explanation: Mt. Etna has been erupting for hundreds of thousands of years. Located in SicilyItalythe volcano produces lava fountains over one kilometer high. Mt. Etna is not only one of the most active volcanoes on Earth, it is one of the largest, measuring over 50 kilometers at its base and rising nearly 3 kilometers high. Pictured in mid-March, a spectacular lava plume erupts upwards, dangerous molten volcanic bombs fly off to the sides, while hot lava flows down the volcano's exterior. The Earth's rotation is discernable on this carefully time, moon-lit, long duration image as star trails.

Astronomy picyure of the day - 2017 April 25 - A Split Ion Tail for Comet Lovejoy E4

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A Split Ion Tail for Comet Lovejoy E4 
Image Credit & Copyright: Fritz Helmut Hemmerich
Explanation: What's happened to Comet Lovejoy? In the pictured image, a processed composite, the comet was captured early this month after brightening unexpectedly and sporting a long and intricate ion tail. Remarkably, thetypically complex effect of the Sun's wind and magnetic field here caused the middle of Comet Lovejoy's ion tail to resemble the head of a needle. Comet C/2017 E4 (Lovejoy) was discovered only last month by noted cometdiscoverer Terry Lovejoy. The comet reached visual magnitude 7 earlier this month, making it a good target for binoculars and long duration exposure cameras. What's happened to Comet Lovejoy (E4) since this image was taken might be considered even more remarkable -- the comet's nucleus appeared to be disintegrating and fading as it neared its closest approach to the Sun two days ago.

segunda-feira, 24 de abril de 2017

Astronomy picture of the day - 2017 April 24 - A White Battle in the Black Sea

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A White Battle in the Black Sea 
Image Credit: NASAAquaMODIS
Explanation: Trillions have died in the Earth's seas. Calcified shields of the dead already make up the white cliffs of Dover. The battle between ball-shaped light-colored single-celled plants -- phytoplankton called coccolithophores -- and even smaller, diamond-shaped viruses dubbed coccolithoviruses -- has raged for tens of millions of years. To help fight this battle, the coccolithophores create their chalky armor by absorbing carbon dioxide from the atmosphere.This battle is so epic that coccolithophores actually remove a significant fraction of Earth's atmospheric carbon dioxide, bolstering the breathability of air for animals including humans. Pictured in this 2012 image from NASA's Aqua satellite, the Black Sea was turned light blue by coccolithophore blooms.

domingo, 23 de abril de 2017

Astronomy picture of the day - 2017 April 23 - The Holographic Principle

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The Holographic Principle 
Image Credit: Caltech
Explanation: Is this picture worth a thousand words? According to the Holographic Principle, the most information you can get from this image is about 3 x 1065 bits for a normal sized computer monitor. The Holographic Principle, yet unproven, states that there is a maximum amount of information content held by regions adjacent to any surface. Therefore, counter-intuitively, the information content inside a room depends not on the volume of the room but on the area of the bounding walls. The principle derives from the idea that the Planck length, the length scale where quantum mechanics begins to dominate classical gravity, is one side of an area that can hold only about one bit of information. The limit was first postulated by physicist Gerard 't Hooft in 1993. It can arise from generalizations from seemingly distant speculation that the information held by a black hole is determined not by its enclosed volume but by the surface area of its event horizon. The term "holographic" arises from a hologram analogy where three-dimension images are created by projecting light though a flat screen. Beware, other people looking at the featured image may not claim to see 3 x 1065 bits -- they might claim to see a teapot.

Artigo - Benfica: A aguia continua a voar cada vez mais alto!

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O sueco Lindelof anulou hoje um erro madrugador de Ederson e anotou o tento que permitiu ao Benfica sair de Alvalade com a liderança segura (1-1), em jogo da 30.ª jornada da I Liga portuguesa de futebol.

No dérbi 300 da história centenária dos dois rivais lisboetas, o guardião benfiquista, tantas vezes ‘herói' para as cores encarnadas, cometeu um deslize que originou a grande penalidade convertida por Adrien, logo aos cinco minutos.

No entanto, aos 66 minutos, o internacional sueco apareceu em zonas pouco habituais e empatou o encontro, na marcação de um livre direto, que se revelou crucial para as ‘contas' dos tricampeões.

Desta forma, o Benfica, que vai fechar a época sem conhecer o sabor da derrota ante os outros dois ‘grandes', segurou a liderança e aumentou provisoriamente para quatro pontos a vantagem sobre o FC Porto, que no domingo recebe o Feirense.

Sem poder contar com o castigado Zeegelaar, Jorge Jesus chamou Jefferson ao lado esquerdo da defesa, tendo igualmente promovido o regresso de Paulo Oliveira ao centro do setor mais recuado, em detrimento de Rúben Semedo.

Já os ‘encarnados' apresentaram-se sem Jonas, que não recuperou dos problemas físicos que o afetaram durante a semana, obrigando Rui Vitória a desviar Rafa para o apoio a Mitroglou e lançando o argentino Cervi na ala canhota do ataque.

A demonstração de que os verdadeiros protagonistas num jogo de futebol são os jogadores ficou bem patente no relvado de Alvalade, no qual não houve as interferências exteriores que tantas vezes transformam o ‘desporto rei' numa ‘guerra' injustificada.

Nos instantes iniciais, Ederson emergiu, de facto, como protagonista, mas pelas piores razões, cedendo à pressão de Bas Dost, que lhe roubou a bola e conquistou uma grande penalidade, convertida por Adrien, ao contrário do que vinha sucedendo nos últimos jogos, nos quais o avançado holandês foi o escolhido, procurando ganhar ‘pontos' na luta pela ‘Bota de Ouro'.

A resposta ao tento do ‘capitão' sportinguista surgiu pelos pés de Salvio, num remate inofensivo para Rui Patrício, que acabou por ser um dos raros momentos de emoção numa primeira parte que se foi desenrolando com muitas perdas de bola de parte a parte e muitas faltas (21 na metade inicial), e, por conseguinte, com inúmeras quebras no ritmo.

Apesar da desvantagem, o Benfica procurou tomar conta das ‘operações' e acercar-se da baliza ‘leonina', ainda que sem infligir qualquer golpe a um adversário que se revelava pouco incisivo na criação e que deixava a dupla Alan Ruiz e Bas Dost alheada do jogo.

De resto, seria já perto do intervalo que os ‘encarnados' conseguiram ‘assustar' verdadeiramente Rui Patrício, o qual foi obrigado a aplicar-se num livre apontado por Grimaldo.

Contudo, no arranque da etapa complementar, os ‘verde e brancos' só não dilataram a vantagem porque Bas Dost estava em dia de pouco acerto e não deu o melhor seguimento a dois lances prometedores.

Primeiro, o ‘artilheiro' do campeonato cabeceou por cima, na sequência de um cruzamento de Adrien, e, depois, desaproveitou uma rápida transição conduzida por Gelson Martins, que lhe ofereceu um tento quase feito.

Ainda assim, as ofensivas dos ‘leões', alicerçadas em vários passes falhados, cingiram-se a esta dupla falha de Bas Dost, o que certamente terá dado alento aos tricampeões nacionais, que sentiam ser possível sair de Alvalade com algo mais que uma derrota.

À passagem da hora de jogo, Mitroglou assustou Rui Patrício, que deteve o remate do grego, só que, pouco depois, o guardião internacional português foi impotente para travar um livre superiormente executado por Lindelof, que anotou o seu primeiro golo esta época e mostrou dotes até agora desconhecidos, dada a precisão do remate.

Sem conseguir acercar-se com verdadeiro perigo da área benfiquista, exceção feita a algumas iniciativas de Gelson Martins, o Sporting ia igualmente permitindo inúmeras transições ao adversário, que só não tiveram consequências de maior porque as ‘águias' pareceram satisfeitas com um dos resultados que servia os seus interesses.

De resto, a 10 minutos do final, Rui Vitória tirou Mitroglou, deixou Raúl Jiménez sozinho na frente e juntou Filipe Augusto a Fejsa no centro, procurando ‘estancar' possíveis focos de perigo criados por Podence e Bryan Ruiz.

Além de ‘trancar' a zona nevrálgica do terreno, o técnico segurou a igualdade e não permitiu mais veleidades ao Sporting, que revelou pouca arte e engenho para ferir o rival e, quiçá, ajudar a afastá-lo do título.

Futebol 365 - Portugal

sábado, 22 de abril de 2017

Fotos - "Barreiro antigo" - (Portugal) - 02-04-2017

"Barreiro antigo"

Rachel Platten - "Fight song" - Video - Music

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"Fight song"

Astronomy picture of the day - 2017 April 22 - Between the Rings

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Between the Rings 
Image Credit: Cassini Imaging TeamSSIJPLESANASA
Explanation: On April 12, as the Sun was blocked by the disk of Saturn the Cassini spacecraft camera looked toward the inner Solar System and the gas giant's backlit rings. At the top of the mosaicked view is the A ring with its broader Encke and narrower Keeler gaps visible. At the bottom is the F ring, bright due to the viewing geometry. The point of light between the rings is Earth, 1.4 billion kilometers in the distance. Look carefully and you can even spot Earth's large moon, a pinprick of light to the planet's left. Today Cassini makes its final close approach to Saturn's own large moon Titan, using Titan's gravity to swing into the spacecraft's Grand Finale, the final set of orbits that will bring Cassini just inside Saturn's rings.

sexta-feira, 21 de abril de 2017

Artigo - Benfica

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O Benfica está há muito a preparar a temporada 2017/18, e nesse sentido, as águias estão no mercado para assegurar desde já as transferências de alguns jogadores. Arango já está garantido, Patrick e Ezequiel Barco são os próximos.

Arango é um avançado colombiano de apenas 22 anos, e já está garantido pelas águias para a próxima temporada, ele que atualmente representa os colombianos do Millonarios.

Patrick é jogador que se segue e o que estará mais perto de assinar com os encarnados. O jogador brasileiro termina ligação com o Marítimo no final desta época, e o Benfica já tem preparado um contrato de três anos, com mais um de opção, para oferecer ao lateral direito de 26 anos.

Ezequiel Barco parece ser o caso mais complicado, mas não por isso impossível. Trata-se de um médio ofensivo argentino de 18 anos, que joga atualmente no Independiente, e cujo passe estará avaliado em 10 milhões de euros, o valor que o clube argentino exige para soltar o jogador.

A Bola - Portugal

Astronomy picture of the day - 2017 April 21 - NGC 4302 and NGC 4298

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NGC 4302 and NGC 4298 
Image Credit: NASAESA, M. Mutchler (STScI)
Explanation: Seen edge-on, spiral galaxy NGC 4302 (left) lies about 55 million light-years away in the well-groomed constellation Coma Berenices. A member of the large Virgo Galaxy Cluster, it spans some 87,000 light-years, a little smaller than our own Milky Way. Like the Milky Way, NGC 4302's prominent dust lanes cut along the center of the galactic plane, obscuring and reddening the starlight from our perspective. Smaller companion galaxy NGC 4298 is also a dusty spiral. But tilted more nearly face-on to our view, NGC 4298 can show off dust lanes along spiral arms traced by the bluish light of young stars, as well as its bright yellowish core. In celebration of the 27th anniversary of the launch of the Hubble Space Telescope on April 24, 1990, astronomers used the legendary telescope to take this gorgeous visible light portrait of the contrasting galaxy pair.

quinta-feira, 20 de abril de 2017

Teresa Salgueiro - "Lisboa" - Slides - Musica

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Fotos - "Barreiro antigo" (Portugal) - 02-04-207

"Barreiro antigo"
(Ao fundo o Rio Tejo e Lisboa)


Astronomy picture of the day - 2017 April 20 - Asteroid 2014 JO25

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Asteroid 2014 JO25 
Image Credit: NASA, JPL-Caltech, Goldstone Solar System Radar
Explanation: A day before its closest approach, asteroid 2014 JO25 was imaged by radar with the 70-meter antenna of NASA's Goldstone Deep Space Communications Complex in California. This grid of 30 radar images, top left to lower right, reveals the two-lobed shape of the asteroid that rotates about once every five hours. Its largest lobe is about 610 meters across. On the list of Potentially Hazardous Asteroids, this space rock made its close approach to our fair planet on April 19, flying safely past at a distance of 1.8 million kilometers. That's over four times the distance from the Earth to the Moon. The asteroid was a faint and fast moving speck visible in backyard telescopes. Asteroid 2014 JO25 was discovered in May 2014 by the Catalina Sky Survey, a project of NASA's Near-Earth Objects Observations Program in collaboration with the University of Arizona.

quarta-feira, 19 de abril de 2017

Astronomy picture of the day - 2017 April 19 - The Red Spider Planetary Nebula

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The Red Spider Planetary Nebula 
Image Credit: NASAESAHubbleHLAReprocessing & Copyright: Jesús M.Vargas & Maritxu Poyal
Explanation: Oh what a tangled web a planetary nebula can weave. The Red Spider Planetary Nebula shows the complex structure that can result when a normal star ejects its outer gases and becomes a white dwarf star. Officially tagged NGC 6537, this two-lobed symmetric planetary nebula houses one of the hottest white dwarfs ever observed, probably as part of a binary star system. Internal winds emanating from the central stars, visible in the center, have been measured in excess of 1000 kilometers per second. These winds expand the nebula, flow along the nebula's walls, and cause waves of hot gas and dust to collide. Atoms caught in these colliding shocks radiate light shown in the above representative-color picture by the Hubble Space Telescope. The Red Spider Nebula lies toward the constellation of the Archer (Sagittarius). Its distance is not well known but has been estimated by some to be about 4,000light-years.

terça-feira, 18 de abril de 2017

Rio de Janeiro - "Cidade maravilhosa" - Slides - Musica

Rio de Janeiro - "Cidade maravilhosa"

Samantha Fox - "Touch me (I want your body) - Video - Music - Live

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"Touch me (I want your body)

Astronomy picture of the day - 2017 April 18 - Night Glows

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Night Glows 
Image Credit & Copyright: Taha Ghouchkanlu
Explanation: What glows in the night? This night, several unusual glows were evident -- some near, but some far. The foreground surf glimmers blue with the light of bioluminescent plankton. Next out, Earth's atmosphere dims the horizon and provides a few opaque clouds. Further out, the planet Venus glows bright near the image center. If you slightly avert your eyes, a diagonal beam of light will stand out crossing behind Venus. This band is zodiacal light, sunlight scattered by dust in our Solar System. Much further away are numerous single bright stars, most closer than 100 light years away. Furthest away, also rising diagonally and making a "V" with the zodiacal light, is the central band of our Milky Way Galaxy. Most of the billions of Milky Way stars and dark clouds are thousands of light years away. The featured image was taken last November on the Iranian coast of Gulf of Oman.

Astronomy picture of the day - 2017 April 17 - Two Million Stars on the Move

Two Million Stars on the Move 
Video Credit: ESAGaiaDPAC
Explanation: If you could watch the night sky for one million years -- how would it change? Besides local effects caused by the Earth's spin and the reorientation of the Earth's spin axis, the stars themselves will move. Combining positional data of unprecedented accuracy for two-million stars taken over years by ESA's Earth-orbiting Hipparcos (now defunct) and Gaia satellites, a future extrapolation of star movements was made over millions years. As shown in the featured video, many stars make only small angular adjustments, but some stars -- typically those nearby -- will zip across the sky. Once familiar constellations and asterisms will become unrecognizable as the bright stars that formed them move around. Not shown are many local nebulas that will surely dissipate while new ones will likely form in different places. Perhaps reassuringly, future Earth inhabitants will still be able to recognize thecentral band of our Milky Way Galaxy.

Astronomy picture of the day - 2017 April 16 - Life-Enabling Plumes above Enceladus

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Life-Enabling Plumes above Enceladus 
Image Credit: Cassini Imaging TeamSSIJPLESANASA
Explanation: Does Enceladus have underground oceans that could support life? The discovery of jets spewing water vapor and ice was detected by the Saturn-orbiting Cassini spacecraft in 2005. The origin of the water feeding the jets, however, was originally unknown. Since discovery, evidence has been accumulating that Enceladus has a deep underground sea, warmed by tidal flexingPictured here, the textured surface of Enceladus is visible in the foreground, while rows of plumes rise from ice fractures in the distance. These jets are made more visible by the Sun angle and the encroaching shadow of night. A recent fly-through has found evidence that a plume -- and so surely the underlying sea -- is rich in molecular hydrogen, a viable food source for microbes that could potentially be living there.

sábado, 15 de abril de 2017

Cyndi Lauper - "Girls, just want to have fun" - Video - Music

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"Girls, just want to have fun" 

Rui Veloso - "Porto sentido" - Audio - Musica

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"Porto sentido"

Astronomy picture of the day - 2017 April 15 - Luminous Salar de Uyuni

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Luminous Salar de Uyuni 
Image Credit & CopyrightStephanie Ziyi Ye
Explanation: A scene in high contrast this thoughtful night skyscape is a modern composition inspired by M. C. Escher's lithograph Phosphorescent Sea. In it, bright familiar stars of Orion the Hunter and Aldebaran, eye of Taurus the Bull, hang in clear dark skies above a distant horizon. Below, faintly luminous edges trace an otherworldly constellation of patterns in mineral-crusted mud along the Uyuni Salt Flat of southwest Bolivia. The remains of an ancient lake, the Uyuni Salt Flat, Salar de Uyuni, is planet Earth's largest salt flat, located on the Bolivian Altiplano at an altitude of about 3,600 meters. Escher's 1933 lithograph also featured familiar stars in planet Earth's night, framing The Ploughor Big Dipper above waves breaking on a more northern shore.

sexta-feira, 14 de abril de 2017

Billy Joel - "Piano man" - Video - Music

"Piano man"

Astronomy picture of the day - 2017 April 14 - Earth Shadow over Damavand

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Earth Shadow over Damavand 
Image Credit & CopyrightMajid Ghohroodi

Explanation: Through crystal clear skies this beautiful panorama follows the curve of planet Earth's shadow rising across the top of the world. The tantalizing twilight view is composed of eight single frames captured from 4,000 meters above sea level at sunset on April 6. Just above the dark grey Earth-shadow boundary lies a fading, pinkish, anti-twilight arch. Also known as the belt of Venus, its reddened and back-scattered sunlight finally merges with the still blue eastern sky. Standing tall near center along the rugged horizon line is the distant sharp peak of Mount Damavand in the snowy Alborz mountains. A feature in Persian mythology and literature, Damavand is a stratovolcano reaching 5,610 meters above sea level, the highest peak in Iran and the Middle East.

Now, it's time to say goodbye. Ciao, ciao, ciao!

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             "CIAO, CIAO, CIAO..."

quinta-feira, 13 de abril de 2017

David Bowie - "Valentine's day" - Video - Music

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"Valentine's day"

Construção de Ponte 25 de Abril - Video - Documentario

A ponte sobre o Rio Tejo que inicialmente tinha o nome de Ponte Salazar, e que depois do 25 de Abril teve o seu nome alterado para Ponte 25 de Abril, foi uma das maiores obras de sempre no nosso Portugal. Miguel Pais foi quem lançou a ideia em 1876, mas só quase um século depois é que a mesma viria a ficar finalizada.

Tendo começado a ser construída em 1962 e terminada em 1966, mais precisamente no dia 6 de Agosto de 1966 quando foi inaugurada, foi uma das poucas obras no nosso país desde então que foi projectada e construída, sem que houvessem derrapagens no orçamento. Foi uma obra feita há quase meio século, mas feita com pés e cabeça, note-se por exemplo que só várias décadas após a construção é que foi implementada a circulação de comboios, mas a ponte já estava preparada para isso. Se fosse actualmente mandava-se abaixo e construía-se outra…

Construção de Ponte 25 de Abril

Imagens - Maravilhas de Cuba - El Salto de Soroa

El Salto de Soroa, bautizado como el Arcoíris de Cuba: una cascada de 22 metros de altura en la que además está permitido bañarse.
El Salto de Soroa, bautizado como el Arcoíris de Cuba: una cascada de 22 metros de altura en la que además está permitido bañarse.

Astronomy picture of the day - 2017 April 13 - Moons and Jupiter

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Moons and Jupiter 
Image Credit & CopyrightGöran Strand

Explanation: On April 10, a Full Moon and Jupiter shared this telephoto field of view. Both were near opposition, opposite the Sun in Earth's night sky. Captured when a passing cloud bank dimmmed the bright moonlight slightly, the single exposure reveals the familiar face of our fair planet's own large natural satellite, along with a line up of the ruling gas giant's four Galilean moons. Labeled top to bottom, the tiny pinpricks of light above bright Jupiter are Callisto,EuropaGanymede, and Io. Closer and brighter, our own natural satellite appears to loom large. But Callisto, Ganymede, and Io are physically larger than Earth's Moon, while water world Europa is only slightly smaller. In fact, of the Solar System's six largest planetary satellites, only Saturn's moon Titan is missing from the scene.

quarta-feira, 12 de abril de 2017

Playing For Change - "Diaraby" - Video - Music - Live

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Astronomy picture of the day - 2017 April 12 - Leo Trio

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Leo Trio 
Image Credit & CopyrightIgnacio Diaz Bobillo
Explanation: This group is popular in the northern spring. Famous as the Leo Triplet, the three magnificent galaxies gather in one field of view. Crowd pleasers when imaged with even modest telescopes, they can be introduced individually as NGC 3628 (left), M66 (bottom right), and M65 (top). All three are large spiral galaxies but they tend to look dissimilar because their galactic disks are tilted at different angles to our line of sight. NGC 3628 is seen edge-on, with obscuring dust lanes cutting across the plane of the galaxy, while the disks of M66 and M65 are both inclined enough to show off their spiral structure. Gravitational interactions between galaxies in the group have also left telltale signs, including the warped and inflated disk of NGC 3628 and the drawn out spiral arms of M66. This gorgeous view of the region spans about one degree (two full moons) on the sky. The field covers over 500 thousand light-years at the trio's estimated distance of 30 million light-years.

terça-feira, 11 de abril de 2017

Article - Médecine. Portugal - Soulever 40 kg ? Facile, avec ce gant intelligent

Un jeune entrepreneur portugais a mis au point un gant destiné à aider les blessés à la main. 

Une blessure à la main, même légère, peut gravement limiter son usage. Filipe Quinaz en a fait l’amère expérience après une fracture, lorsqu’il était étudiant en biomédecine à l’université de Beira Interior (centre du Portugal). Le jeune homme a alors commencé à réfléchir à des solutions pour aider les personnes dans son cas.
Suivi en temps réel

Quelques années plus tard, le résultat est un gant qui permet de soulever jusqu’à 40 kg sans effort. Composé de textiles intelligents truffés de capteurs électroniques, il permet également aux soignants de suivre en temps réel l’évolution de l’état de la main de leurs patients. Le produit s’adresse en priorité “aux accidentés, aux personnes atteintes d’arthrite ou ayant souffert d’un AVC”, détaille le Diário de Notícias.

Nuada, la start-up fondée par Filipe Quinaz, a intégré début 2017 l’accélérateur Uten (University Technology Enterprise Network), fruit d’un partenariat entre le gouvernement portugais et l’université du Texas à Austin. L’entreprise espère pouvoir réaliser les premières préventes de son gant à l’été.

Courrier International - France

Imagens - Maravilhas de Cuba - Cayo Guillermo

Playas de Cuba
Uma praia paradisíaca en Cayo Guillermo.

Astronomy picture of the day - 2017 April 11 - Man, Dog, Sun

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Man, Dog, Sun 
Image Credit & Copyright: Jens Hackmann
Explanation: This was supposed to be a shot of trees in front of a setting Sun. Sometimes, though, the unexpected can be photogenic. During some planning shots, a man walking his dog unexpected crossed the ridge. The result was so striking that, after cropping, it became the main shot. The reason the Sun appears so large is that the image was taken from about a kilometer away through a telephoto lens. Scattering of blue light by the Earth's atmospheremakes the bottom of the Sun appear slightly more red that the top. Also, if you look closely at the Sun, just above the man's head, a large group of sunspots is visible. The image was taken just last week in Bad Mergentheim,Germany.

segunda-feira, 10 de abril de 2017

Astronomy picture of the day - 2017 April 10 - Galaxy Cluster Gas Creates Hole in Microwave Background

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Galaxy Cluster Gas Creates Hole in Microwave Background 
Image Credit: ALMA (ESO/NAOJ/NRAO), Kitayama et al.NASA/ESA Hubble Space Telescope
Explanation: Why would this cluster of galaxy punch a hole in the cosmic microwave background (CMB)? First, the famous CMB was created by cooling gas in the early universe and flies right through most gas and dust in the universe. It is all around us. Large clusters of galaxies have enough gravity to contain very hot gas -- gas hot enough to up-scatter microwave photons into light of significantly higher energy, thereby creating a hole in CMB maps. ThisSunyaev–Zel'dovich (SZ) effect has been used for decades to reveal new information about hot gas in clusters and even to help discover galaxy clusters in a simple yet uniform way. Pictured is the most detailed image yet obtained of the SZ effect, now using both ALMA to measure the CMB and the Hubble Space Telescope to measure the galaxies in the massive galaxy cluster RX J1347.5-1145False-color blue depicts light from the CMB, while almost every yellow object is a galaxy. The shape of the SZ hole indicates not only that hot gas is present in this galaxy cluster, but also that it is distributed in a surprisingly uneven manner.

domingo, 9 de abril de 2017

Astronomy picture of the day - 2017 April 9 - Comet Hale-Bopp Over Val Parola Pass

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Comet Hale-Bopp Over Val Parola Pass 
Image Credit & Copyright: A. Dimai, (Col Druscie Obs.), AAC
Explanation: Comet Hale-Bopp, the Great Comet of 1997, became much brighter than any surrounding stars. It was seen even over bright city lights. Away from city lights, however, it put on quite a spectacular show. Here Comet Hale-Bopp was photographed above Val Parola Pass in the Dolomite mountains surrounding Cortina d'AmpezzoItalyComet Hale-Bopp's blue ion tail, consisting of ions from the comet's nucleus, is pushed out by the solar wind. The white dust tail is composed of larger particles of dust from the nucleus driven by the pressure of sunlight, that orbit behind the comet. Comet Hale-Bopp (C/1995 O1) remained visible to the unaided eye for 18 months -- longer than any other comet in recorded history. This year marks the 20th anniversary of Comet Hale-Bopp's last trip to the inner Solar System. The large comet is next expected to return around the year 4385.

sábado, 8 de abril de 2017

Astronomy picture of the day - 2017 April 8 - Zeta Oph: Runaway Star

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Zeta Oph: Runaway Star 
NASAJPL-CaltechSpitzer Space Telescope

Explanation: Like a ship plowing through cosmic seas, runaway star Zeta Ophiuchi produces the arcing interstellar bow wave or bow shock seen in this stunning infrared portrait. In the false-color view, bluish Zeta Oph, a star about 20 times more massive than the Sun, lies near the center of the frame, moving toward the left at 24 kilometers per second. Its strong stellar wind precedes it, compressing and heating the dusty interstellar material and shaping the curved shock front. What set this star in motion? Zeta Oph was likely once a member of a binary star system, its companion star was more massive and hence shorter lived. When the companion exploded as a supernova catastrophically losing mass, Zeta Oph was flung out of the system. About 460 light-years away, Zeta Oph is 65,000 times more luminous than the Sun and would be one of the brighter stars in the sky if it weren't surrounded by obscuring dust. The image spans about 1.5 degrees or 12 light-years at the estimated distance of Zeta Ophiuchi.

sexta-feira, 7 de abril de 2017

Astronomy picture of the day - 2017 April 7 - Castle Eye View

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Castle Eye View 
Image Credit & CopyrightStephane Vetter (Nuits sacrees, TWAN)
Explanation: The best known asterism in northern skies, The Big Dipper is easy to recognize, even when viewed upside down, though some might see a plough or wagon. The star names and the familiar outlines appear framed in the ruined tower walls of the French Chateau du Morimont if you just slide your cursor over the image or follow this linkDubhe, alpha star of the dipper's parent constellation Ursa Major is at the lower left. Together with beta star Merakthe two form a line pointing the way to Polaris and the North Celestial Pole, hidden from view by the stones. Since the image was captured on March 30, you can follow a line from dipper stars Phecda and Megrez to spot the faint greenish glow of Comet 41P/Tuttle-Giacobini-Kresak below center, still within the castle eye view. The periodic comet made a remarkable close approach to planet Earth on April 1.

Pedro Abrunhosa - "Se eu fosse um dia o teu olhar" - Video - Musica - Ao vivo

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"Se eu fosse um dia o teu olhar"

quinta-feira, 6 de abril de 2017

Astronomy picture of the day - 2017 April 6 - Filaments of Active Galaxy NGC 1275

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Filaments of Active Galaxy NGC 1275 
Image Credit: Hubble Legacy ArchiveESANASAProcessing & Copyright: Domingo Pestana
Explanation: What keeps these filaments attached to this galaxy? The filaments persist in NGC 1275 even though the turmoil of galactic collisions should destroy them. First, active galaxy NGC 1275 is the central, dominant member of the large and relatively nearby Perseus Cluster of Galaxies. Wild-looking at visible wavelengths, the active galaxy is also a prodigious source of x-rays and radio emission. NGC 1275 accretes matter as entire galaxies fall into it, ultimately feeding a supermassive black hole at the galaxy's core. This composite image, recreated from archival Hubble Space Telescope data, highlights the resulting galactic debris and filaments of glowing gas, some up to 20,000 light-years long. Observations indicate that the structures, pushed out from the galaxy's center by the black hole's activity, are held together by magnetic fields. Also known as Perseus A, NGC 1275 spans over 100,000 light years and lies about 230 million light years away.