Dawn of the Dish. This serene southern skyview of the much anticipated predawn conjunction includes the lovely Pleiades star cluster and bright stars Aldebaran and Betelgeuse in the celestial lineup. (Photo/ NASA)??

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Moon Meets Jupiter. Skygazers around planet Earth enjoyed the close encounter of planets and Moon in July 15's predawn skies. (Photo/ NASA)

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The Eagle Rises. Get out your red/blue glasses and check out this remarkable stereo view from lunar orbit. (Photo/ NASA)

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The Gegenschein Over Chile. Is the night sky darkest in the direction opposite the Sun? No. In fact, a rarely discernable faint glow known as the gegenschein (German for "counter glow") can be seen 180 degrees around from the Sun in an extremely dark sky. (Photo/ NASA)

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A Quadruple Lunar Halo Over Spain. Sometimes falling ice crystals make the atmosphere into a giant lens causing arcs and halos to appear around the Sun or Moon. This past Saturday night was just such a time near Madrid, Spain, where a winter sky displayed not only a bright Moon but as many as four rare lunar halos. (Photo/ NASA

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In the Center of Saturn's North Polar Vortex. What's happening at the north pole of Saturn? A vortex of strange and complex swirling clouds. The center of this vortex was imaged in unprecedented detail last week by the robotic Cassini spacecraft orbiting Saturn. (Photo/ NASA)

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Plasma Jets from Radio Galaxy Hercules A. Why does this galaxy emit such spectacular jets? No one is sure, but it is likely related to an active supermassive black hole at its center. The galaxy at the image center, Hercules A, appears to be a relatively normal elliptical galaxy in visible light. (Photo/ NASA)

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47 Tuc Near the Small Magellanic Cloud. Globular star cluster 47 Tucanae is a jewel of the southern sky. Also known as NGC 104, it roams the halo of our Milky Way Galaxy along with around 200 other globular star clusters. (Photo/ NASA)

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GRAIL's Gravity Map of the Moon. This image shows the variations in the lunar gravity field as measured by NASA's Gravity Recovery and Interior Laboratory (GRAIL) during the primary mapping mission from March to May 2012. (Photo/ NASA)

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Tiny Tethys. Tethys may not be tiny by normal standards, but when it is captured alongside Saturn, it can't help but seem pretty small. (Photo/ NASA)

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Earth at Night. This remarkably complete view of Earth at night is a composite of cloud-free, nighttime images. The images were collected during April and October 2012 by the Suomi-NPP satellite from polar orbit about 824 kilometers (512 miles) above the surface using its Visible Infrared Imaging Radiometer Suite (VIIRS). (Photo/ NASA)

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