"This magic moment"
2016-11-13
Expressões populares portuguesas - "Queimar as pestanas"
Significado: Estudar muito.
Origem: Usa-se ainda esta expressão, apesar de o facto real que a originou já não ser de uso. Foi, inicialmente, uma frase ligada aos estudantes, querendo significar aqueles que estudavam muito. Antes do aparecimento da electricidade, recorria-se a uma lamparina ou uma vela para iluminação. A luz era fraca e, por isso, era necessário colocá-las muito perto do texto quando se pretendia ler o que podia dar azo a " queimar as pestanas".
Astronomy picture of the day - 2016 November 13 - Super Moon vs. Micro Moon
Image Credit & Copyright: Catalin Paduraru
Explanation: What is so super about tomorrow's supermoon? Tomorrow, a full moon will occur that appears slightly larger and brighter than usual. The reason is that the Moon's fully illuminated phase occurs within a short time from perigee - when the Moon is its closest to the Earth in its elliptical orbit. Although the precise conditions that define a supermoon vary, tomorrow's supermoon will undoubtedly qualify because it will be the closest, largest, and brightest full moon in over 65 years. One reason supermoons are popular is because they are so easy to see -- just go outside and sunset and watch an impressive full moon rise! Since perigee actually occurs tomorrow morning, tonight's full moon, visible starting at sunset, should also be impressive. Pictured here, a supermoon from 2012 is compared to a micromoon -- when a full Moon occurs near the furthest part of the Moon's orbit -- so that it appears smaller and dimmer than usual. Given many definitions, at least one supermoon occurs each year, with another one coming next month (moon-th). However, a full moon will not come this close to Earth again until 2034.
Artigo - Sismo de magnitude 7,8 perto de Christchurch, na Nova Zelândia - Alerta Tsunami
Um sismo de magnitude 7,8 na escala de Richter abalou este domingo a ilha sul da Nova Zelândia. Apesar do número inicial apontar para uma magnitude de 7,4, o Instituto Geológico dos Estados Unidos atualizou a informação disponível para 7,8.
De acordo com o organismo norte-americano, epicentro foi localizado a 53 quilómetros de Amberley e a 95 quilómetros de Christchurch, onde também foi sentido. Tamsin Edendor disse à France-Press que o tremor de terra durou “muito” tempo. “Estávamos a dormir e acordámos com a casa a abanar. Continuou a abanar e a abanar e pensei que fosse cair”, contou a mãe de duas crianças.
Fonte: Instituto Geológico dos Estados Unidos da América
Apesar de o Centro de Tsunamis do Pacífico não ter emitido nenhum alerta, a proteção civil neo-zelandesa lançou um aviso de perigo para toda a costa este da ilha, que inclui as cidades de Christchurch e Wellington e as ilhas Chatham. O organismo aconselhou todas as pessoas que se encontrem perto do mar a mudarem-se para um ponto alto o mais depressa possível.
Observador - Portugal
2016-11-12
Astronomy picture of the day - 2016 November 12 - Great Rift Near the Center of the Milky Way
Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors)
Explanation: Over 100 telescopic image panels in this stunning vertical mosaic span about 50 degrees across the night sky. They follow part of the Great Rift, the dark river of dust and molecular gas that stretches along the plane of our Milky Way Galaxy. Start at top center and you can follow the galactic equator down through brighter stars in constellations Aquila, Serpens Cauda, and Scutum. At the bottom is Sagittarius near the center of the Milky Way. Along the way you'll encounter many obscuring dark nebulae hundreds of light-years distant flanked by bands of Milky Way starlight, and the telltale reddish glow of starforming regions. Notable Messier objects include The Eagle (M16) and Omega (M17) nebulae, the Sagittarius Star Cloud (M24), the beautiful Trifid (M20) and the deep Lagoon (M8).
2016-11-11
Astronomy picture of the day - 2016 November 11 - NGC 7822 in Cepheus
Image Credit & Copyright: Steve Cannistra (StarryWonders)
Explanation: Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, the glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and dark shapes stand out in this colorful skyscape. The image includes data from narrowband filters, mapping emission from atomic oxygen, hydrogen, and sulfur into blue, green, and red hues. The emission line and color combination has become well-known as the Hubble palette. The atomic emission is powered by energetic radiation from the central hot stars. Their powerful winds and radiation sculpt and erode the denser pillar shapes and clear out a characteristic cavity light-years across the center of the natal cloud. Stars could still be forming inside the pillars by gravitational collapse but as the pillars are eroded away, any forming stars will ultimately be cutoff from their reservoir of star stuff. This field of view spans over 40 light-years at the estimated distance of NGC 7822.
2016-11-10
Astronomy picture of the day - 2016 November 10 - M63: The Sunflower Galaxy from Hubble
Image Credit: ESA, NASA, Hubble
Explanation: One of the bright spiral galaxies visible in the north sky is M63, the Sunflower Galaxy. M63, also catalogued as NGC 5055, can be found with a small telescope toward the constellation of Hunting Dogs (Canes Venatici). The featured picture from the Hubble Space Telescope exhibits the center of M63, complete with long winding spiral arms glowing blue from a few bright young stars, emission nebulae glowing red from hot ionized hydrogen gas, and dark dust in numerous filaments. M63 interacts gravitationally with M51 (the Whirlpool Galaxy) and several smaller galaxies. Light takes about 35 million years to reach us from M63, and about 60,000 years to cross the spiral galaxy. Stars in the outer regions of the Sunflower Galaxy rotate about the center at a speed so high that, given the matter seen and assuming normal gravity, they should fly off into space. The fact that the stars remain indicates the presence of sort of invisible, gravitationally-binding, dark matter.
2016-11-09
Astronomy picture of the day - 2016 November 9 - Inverted City Beneath Clouds
Image Credit & Copyright: Mark Hersch
Explanation: How could that city be upside-down? The city, Chicago, was actually perfectly right-side up. The long shadows it projected onto nearby Lake Michigan near sunset, however, when seen in reflection, made the buildings appear inverted. This fascinating, puzzling, yet beautiful image was captured by a photographer in 2014 on an airplane on approach to Chicago's O'Hare International Airport. The Sun can be seen both above and below the cloud deck, with the latter reflected in the calm lake. As a bonus, if you look really closely -- and this is quite a challenge -- you can find another airplane in the image, likely also on approach to the same airport.
2016-11-06
Astronomy picture of the day - 2016 November 6 - Starburst Cluster in NGC 3603
Image Credit: NASA, ESA, Hubble Heritage (STScI/AURA)-ESA/ Hubble Collaboration;
Acknowledgment: J. Maiz Apellaniz (Inst. Astrofisica Andalucia) et al., & Davide de Martin (skyfactory.org)
Explanation: A mere 20,000 light-years from the Sun lies NGC 3603, a resident of the nearby Carina spiral arm of our Milky Way Galaxy. NGC 3603 is well known to astronomers as one of the Milky Way's largest star-forming regions. The central open star cluster contains thousands of stars more massive than our Sun, stars that likely formed only one or two million years ago in a single burst of star formation. In fact, nearby NGC 3603 is thought to contain a convenient example of the massive star clusters that populate much more distant starburst galaxies. Surrounding the cluster are natal clouds of glowing interstellar gas and obscuring dust, sculpted by energetic stellar radiation and winds.Recorded by the Hubble Space Telescope, the image spans about 17 light-years.
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