Category: Astronomy

The Aurora and the Sunrise : On the Internati…

The Aurora and the Sunrise : On the International Space Station (ISS), you can only admire an aurora until the sun rises. Then the background Earth becomes too bright. Unfortunately, after sunset, the rapid orbit of the ISS around the Earth means that sunrise is usually less than 47 minutes away. In the featured image, a green aurora is visible below the ISS – and on the horizon to the upper right, while sunrise approaches ominously from the upper left. Watching an aurora from space can be mesmerizing as its changing shape has been compared to a giant green amoeba. Auroras are composed of energetic electrons and protons from the Sun that impact the Earth’s magnetic field and then spiral down toward the Earth so fast that they cause atmospheric atoms and molecules to glow. The ISS orbits at nearly the same height as auroras, many times flying right through an aurora’s thin upper layers, an event that neither harms astronauts nor changes the shape of the aurora. via NASA

Russian ISS Control in Moscow (desktop/laptop…

Russian ISS Control in Moscow (desktop/laptop)

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Thor’s Helmet (desktop/laptop)Click the…

Thor’s Helmet (desktop/laptop)

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Ganymede: A Moon Like No Other : Far across th…

Ganymede: A Moon Like No Other : Far across the solar system, where Earth appears merely as a pale blue dot, NASA’s Galileo spacecraft spent eight years orbiting Jupiter. Newly resurrected data from Galileo’s first flyby of Jupiter’s moon Ganymede is yielding new insights. (via NASA)

Monster Sunspot Releases – Class Solar Flare …

Monster Sunspot Releases – Class Solar Flare (desktop/laptop)

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Northrop Grumman’s Antares Rocket on the…

Northrop Grumman’s Antares Rocket on the Pad via NASA https://ift.tt/2FldjsT

Northop Grumman’s Antares Rocket on the …

Northop Grumman’s Antares Rocket on the Pad via NASA https://ift.tt/2z85XDC

Full Moon (desktop/laptop)Click the image to …

Full Moon (desktop/laptop)

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Magellanic Mountain : Flanked by satellite gal…

Magellanic Mountain : Flanked by satellite galaxies of the Milky Way a volcanic peak rises from this rugged horizon. The southern night skyscape looks toward the south over Laguna Lejia and the altiplano of the Antofagasta Region of northern Chile. Extending the view across extragalactic space, the Large (right) and Small Magellanic Clouds are so named for the 16th century Portuguese explorer Ferdinand Magellan, leader of planet Earth’s first circumnavigation. The larger cloud lies some 180,000 light-years, and the smaller 210,000 light-years beyond the mountaintop. Left of the Small Cloud of Magellan and also reflected in the foreground watery shallows on that starry night, 47 Tucanae shines like a bright star. A globular star cluster that roams the halo of the Milky Way, 47 Tucanae is about 13,000 light-years away. via NASA

Stellar Cluster RCW 38 : Protostar (desktop/l…

Stellar Cluster RCW 38 : Protostar (desktop/laptop)

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