• Melbourne, Australia

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Explanation: An old Moon and the stars of Orion rose above the eastern horizon on August 10. The Moon's waning crescent was still bright enough to be overexposed in this snapshot taken from another large satellite of planet Earth, the International Space Station. A greenish airglow traces the atmosphere above the limb of the planet's night. Below, city lights and lightning flashes from thunderstorms appear over southern Mexico.

Melbourne by night

Explanation: This is the mess that is left when a star explodes. The Crab Nebula, the result of a supernova seen in mysterious filaments. The filaments are not only tremendously complex, but appear to have less mass than expelled in the original supernova and a higher speed than expected from a free explosion. The featured image, taken by the Hubble Space Telescope, is presented in three colors chosen for scientific interest.

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See Explanation. Clicking on the picture will download the highest resolution version available.

Explanation: Palomar 12 was not born here. The stars of the globular cluster, first identified in the Palomar Sky Survey, are younger than those in other globular star clusters that roam the halo of our Milky Way Galaxy. Palomar 12's position in our galaxy and measured motion suggest its home was once the Sagittarius Dwarf Elliptical Galaxy, a small satellite of the Milky Way. Disrupted by gravitational tides during close encounters the satellite galaxy has lost its stars to the larger Milky Way. Now part of the Milky Way's halo, the tidal capture of Palomar 12 likely took place some 1.7 billion years ago. Seen behind spiky foreground stars in the sharp Hubble image, Palomar 12 spans nearly 60 light-years. Still much closer than the faint, fuzzy, background galaxies scattered throughout the field of view, it lies about 60,000 light-years away, toward the constellation Capricornus.

Sam Cristoforetti on Twitter: "One last peak before bedtime. Un'ultima occhiata prima di dormire.";

Sam Cristoforetti on Twitter: "On some rare occasions you need sunglasses even on ISS, like releasing #Dragon just after sunrise in front of you.";

Gates McFadden on Twitter: "#KrusherDoesKrusher @gates_plays @reneauberjonois Wil Wheaton @AnneWheaton @TheDeniseCrosby @JonnieDelArco @WilliamShatner";

Sam Cristoforetti on Twitter: "How do you like what the sunglint is making of this bay in Baja California? #HelloEarth";

Sam Cristoforetti on Twitter: "Remembering #Galileo on his birthday. He showed us the way to ask the stars about the mysteries of the universe.";

Terry W. Virts on Twitter: "Northern Europe under a green electron cloud - Kaliningrad & Gdansk in front, Copenhagen, Oslo, & Stockholm in back";

Universe Science on Twitter: "Hubble captures rare triple-moon conjunction.";

Sam Cristoforetti on Twitter: "A lot of critical equipment of #ISS is out there on the truss, in the vacuum of #space. #OurOutpostInSpace";

Faces in Things on Twitter: "Close your mouth when you chew!";

Explanation: From January 11 to February 25 2013, a pinhole camera sat in a field near Budapest, Hungary, planet Earth to create this intriguing solargraph. And for 45 days, an old Antonov An-2 biplane stood still while the Sun rose and set. The camera's continuous exposure began about 20 days after the northern hemispere's winter solstice, so each day the Sun's trail arcs steadily higher through the sky. These days in the Sun were recorded on a piece of black and white photosensitive paper tucked in to the simple plastic film container. The long exposure produced a visible color image on the paper that was then digitally scanned. Of course, cloudy days left gaps in the solargraph's Sun trails.

Amy Shira Teitel on Twitter: "Olde timey space picture for the day, a favourite shot of Gemini 7 as seen from Gemini 6 during rendezvous. 1965.";

Terry W. Virts on Twitter: "My #spacewalk lead #AstroButch, with me upside down in his visor.";

Terry W. Virts on Twitter: "Shades of light!";

Camilla on Twitter: "Probably my favourite picture of Leonard Nimoy. His eyes, voice & poise were majestic. LLAP all.";

SpaceCenterHou on Twitter: "You boldly took us where no one had gone before and inspired generations of explorers. #LeonardNimoy";