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sábado, 22 de julho de 2017

Astronomy picture of the day - 2017 July 22 - Apollo 11: Catching Some Sun

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Apollo 11: Catching Some Sun 
Image Credit: Apollo 11NASA (Image scanned by Kipp Teague)
Explanation: Bright sunlight glints and long dark shadows mark this image of the lunar surface. It was taken July 20, 1969 by Apollo 11 astronaut Neil Armstrong, the first to walk on the MoonPictured is the mission's lunar module, the Eagle, and spacesuited lunar module pilot Buzz Aldrin unfurling a long sheet of foil also known as the Solar Wind Composition Experiment. Exposed facing the Sun, the foil trapped particles streaming outward in the solar wind, catching a sample of material from the Sun itself. Along with moon rocks and lunar soil samples, the solar wind collector was returned for analysis in earthbound laboratories.

sexta-feira, 21 de julho de 2017

Astronomy picture of the day - 2017 July 21 - Phobos: Moon over Mars

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Phobos: Moon over Mars 
Image Credit: NASAESA, Zolt Levay (STScI) - Acknowledgment: J.Bell (ASU) and M.Wolff (SSI)
Explanation: A tiny moon with a scary name, Phobos emerges from behind the Red Planet in this timelapse sequence from the Earth-orbiting Hubble Space Telescope. Over 22 minutes the 13 separate exposures were captured near the 2016 closest approach of Mars to planet Earth. Martians have to look to the west to watch Phobos rise, though. The small moon is closer to its parent planet than any other moon in the Solar System, about 3,700 miles (6,000 kilometers) above the Martian surface. It completes one orbit in just 7 hours and 39 minutes. That's faster than a Mars rotation, which corresponds to about 24 hours and 40 minutes. So on Mars, Phobos can be seen to rise above the western horizon 3 times a day. Still, Phobos is doomed.

Artigo - Saude - Detetada bactéria fecal na McDonald's



Uma bactéria coliforme fecal foi descoberta em amostras de gelo de restaurantes da McDonald's, Burger King e KFC, no Reino Unido, revelou o programa "Watchdog", da BBC.

Em sete restaurantes KFC, seis Burger King e três McDonald's foi detetada a bactéria no gelo e água. De acordo com o jornal Metro, quatro das amostras recolhidas de restaurantes Burger King e cinco da KFC tinham um nível "significante" da bactéria.

De acordo com a DEFRA, o órgão britânico que regula a qualidade da água, não deveria existir a bactéria em questão, em qualquer quantidade, na água usada para consumo humano, diz o Business Insider.

quinta-feira, 20 de julho de 2017

Astronomy picture of the day - 2017 July 20 - IC 1396: Emission Nebula in Cepheus

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IC 1396: Emission Nebula in Cepheus 
Image Credit & Copyright: César Blanco González
Explanation: Stunning emission nebula IC 1396 mixes glowing cosmic gas and dark dust clouds in the high and far off constellation of Cepheus. Energized by the bright central star seen here, this star forming region sprawls across hundreds of light-years, spanning over three degrees on the sky while nearly 3,000 light-years from planet Earth. Among the intriguing dark shapes within IC 1396, the winding Elephant's Trunk nebula lies just below center. Stars could still be forming inside the dark shapes by gravitational collapse. But as the denser clouds are eroded away by powerful stellar winds and radiation, any forming stars will ultimately be cutoff from the reservoir of star stuff. The gorgeous color view is a composition of image data from narrowband filters, mapping emission from the nebula's atomic oxygen, hydrogen, and sulfur into blue, green, and red hues.

quarta-feira, 19 de julho de 2017

Astronomy picture of the day - 2017 July 19 - Ireson Hill on Mars

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Ireson Hill on Mars 
Image Credit: NASAJPL-CaltechMSSS
Explanation: What created this unusual hill on Mars? Its history has become a topic of research, but its shape and two-tone structure makes it one of the more unusual hills that the robotic Curiosity rover on Mars has rolled near. Dubbed Ireson Hill, the mound rises about 5 meters high and spans about 15 meters across. Ireson Hill is located on the Bagnold Dune field on the slope of Mount Sharp in Gale Crater on Mars. The featured 41-image panorama has been horizontally compressed to include the entire hill. The image was taken on February 2 and released last week. Because Mars is moving behind the Sun as seen from the EarthNASA will soon stop sending commands to itsMartian orbiters and rovers until about August 1.

terça-feira, 18 de julho de 2017

Astronomy picture of the day - 2017 July 18 - Thunder Moon over Pisa


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Thunder Moon over Pisa 
Image Credit & Copyright: Marco Meniero
Explanation: What's wrong with this picture? If you figure it out, you may then realize where the image was taken. The oddity lies actually in one of the buildings -- it leans. The Leaning Tower of Pisa has been an iconic legend since shortly after its construction began in the year 1173. Now part of a UNESCO World Heritage Sitefolklore holds that Galileo used the leaning tower to dramatically demonstrate the gravitational principle that objects of different massfall the same. Between the Leaning Tower of Pisa on the right and Pisa Cathedral and the Pisa Baptistery on the left, a full "Thunder" moon was visible last week when the image was taken. Using modern analyses, the tower has been successfully stabilized and, barring the unexpected, should hold its present tilt for the next 200 years.

segunda-feira, 17 de julho de 2017

Astronomy picture of the day - 2017 July 17 - Moon Shadow versus Sun Reflection

Moon Shadow versus Sun Reflection 
Image Credit: Himawari-8, NASA's SVS (GSFC)
Explanation: What are those lights and shadows crossing the Earth? As the featured five-second time-lapse video progresses, a full day on planet Earth is depicted as seen from Japan's Himawari-8 satellite in geostationary orbit high above the Pacific Ocean. The Sun rises to the right and sets to the left, illuminating the half of Earth that is most directly below. A reflected image of the Sun -- a Sun glint -- is visible as a bright spot that moves from right to left. More unusual, though, is the dark spot that moves from the lower left to upper right That is the shadow of the Moon, and it can only appear when the Moon goes directly between the Earth and the Sun. Last year, on the day these images were taken, the most deeply shadowed region experienced a total eclipse of the Sun. Next month a similarly dark shadow will sweep right across the USA.

domingo, 16 de julho de 2017

Astronomy picture of the day - 2017 July 16

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Lightning Eclipse from the Planet of the Goats 
Image Credit & Copyright: Chris Kotsiopoulos (GreekSky)
Explanation: Thunderstorms almost spoiled this view of the spectacular 2011 June 15 total lunar eclipse. Instead, storm clouds parted for 10 minutes during the total eclipse phase and lightning bolts contributed to the dramatic sky. Captured with a 30-second exposure the scene also inspired one of the more memorable titles (thanks to the astrophotographer) in APOD's now 22-year history. Of course, the lightning reference clearly makes sense, and the shadow play of the dark lunar eclipse was widely viewed across planet Earth in Europe, Africa, Asia, and Australia. The picture itself, however, was shot from the Greek island of Ikaria at Pezi. That area is known as "the planet of the goats" because of the rough terrain and strange looking rocks.

sábado, 15 de julho de 2017

Astronomy picture of the day - 2017 July 15 - Close-up of The Great Red Spot

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Close-up of The Great Red Spot 
Image Credit: NASAJunoSwRIMSSSGerald EichstadtSean Doran
Explanation: On July 11, the Juno spacecraft once again swung near to Jupiter's turbulent cloud tops in its looping 53 day orbit around the Solar System's ruling gas giant. About 11 minutes after perijove 7, its closest approach on this orbit, it passed directly above Jupiter's Great Red Spot. During the much anticipated fly over, it captured this close-up image data from a distance of less than 10,000 kilometers. The raw JunoCam data was subsequently processed by citizen scientists. Very long-lived but found to be shrinking, the Solar System's largest storm system was measure to be 16,350 kilometers wide on April 15. That's about 1.3 times the diameter of planet Earth.

sexta-feira, 14 de julho de 2017

Astronomy picture of the day - 2017 July 14 - NGC 4449: Close-up of a Small Galaxy

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NGC 4449: Close-up of a Small Galaxy 
Image Credit & Copyright: Data - Hubble Legacy ArchiveESANASA;
Processing - Domingo Pestana GalvanRaul Villaverde Fraile
Explanation: (xxxedit and linkxxx) Grand spiral galaxies often seem to get all the glory. Their young, blue star clusters and pink star forming regions along sweeping spiral arms are guaranteed to attract attention. But small irregular galaxies form stars too, like NGC 4449, about 12 million light-years distant. Less than 20,000 light-years across, the small island universe is similar in size, and often compared to our Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC). This remarkable Hubble Space Telescope close-up of the well-studied galaxy was reprocessed to highlight the telltale reddish glow of hydrogen gas. The glow traces NGC 4449's widespread star forming regions, some even larger than those in the LMC, with enormous interstellar arcs and bubbles blown by short-lived, massive stars. NGC 4449 is a member of a group of galaxies found in the constellation Canes Venatici. It also holds the distinction of being the first dwarf galaxy with an identified tidal star stream.