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	+ Home   Choose another category:   + Life on Earth + Humans in Space Saturn is the only planet in our solar system that is less dense than water. It could float in a bathtub if such a huge thing could be built. + More NASA Facts...		+ NASA Home > Exploring the Universe > Main Features       Youthful Star Sprouts Planets Early + Read More     New Views of Martian Moons + Mars Recon Orbiter Site     Astronomers Say Moons Like Ours Are Uncommon The next time you take a moonlit stroll, or admire a full, bright-white moon looming in the night sky, you might count yourself lucky. + Read More     Hubble Zooms in on Heart of Mystery Comet NASA's Hubble Space Telescope has probed the bright core of Comet 17P/Holmes, which mysteriously brightened by nearly a millionfold in October. + Read More     Watching Galaxies Grow Old Gracefully In the early 1900s, Edwin Hubble made the startling discovery that our Milky Way galaxy is not alone. + Read More     Record Fifth Planet Found Orbiting Nearby Star Astronomers have announced the discovery of a fifth planet circling 55 Cancri, a star beyond our solar system. + Read More     Probing the Red Planet's Unusual Deposits The radar system on the European Space Agency's Mars Express orbiter has uncovered new details about some of the most mysterious deposits on Mars: the Medusae Fossae Formation. + Read More     + View Archives         Galaxy A system of stars, dust, and gas held together by gravity. + View site           Cliffbot Shines in Arctic Rehearsal for Mars + View this video (no caption) + View this video (with caption)     Mars Reconnaissance Orbiter Context Imager Instrument Pointing Simulation This animation highlights the orbiter’s context imager as it took and returned its first image. + View this movie (no audio)     Mars Reconnaissance Orbiter First Images of Mars from HiRISE This animation highlights the first images returned by the orbiter’s HiRISE (High Resolution Imaging Science Experiement) camera. + View this movie (no audio)     + View Archives         Science @ NASA + View site     NASA's Astrobiology Magazine + View site
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