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Planet pairing

Mars passes Saturn tonight, providing a striking color contrast as darkness falls

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Rosetta scientists narrow down locations for comet lander

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Supernova study

Chandra searches for trigger of January supernova in M82

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Midsize measurement

Confirming the existence of intermediate-mass black holes

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Uwingu Mars

Name a crater ... make an impact!

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Starmus 2014 Rocks Astronomy!

Join astronomy’s greatest minds in the Canary Islands, September 22–27, 2014. New speakers continue to be announced!

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Observing Basics

Your Eyes & Observing

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Comet close-up

Rosetta becomes the first spacecraft to rendezvous with a comet

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Planet pairing

Mars passes Saturn tonight, providing a striking color contrast as darkness falls

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PICTURE OF THE DAYsee all »

Venus and Jupiter

Venus (left) and Jupiter glow in the early dawn as they rise above Milwaukee’s McKinley Marina on Monday morning, August 18. Although hundreds of millions of miles separated the planets, they appeared to be nearly in line, separated by less than the width of the Moon. (Nikon D700 DSLR, 70-200mm f/2.8 lens set at f/8, ISO 800, 2-second exposure, taken August 18, 2014, at 5:15 A.M. CDT)
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