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Ch-ch-changes

For the first time, astronomers have detected atmospheric variability on a rocky planet outside the solar system

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Ends July 24, 2015

Solar warmth

Strong evidence for coronal heating by nanoflares

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Apollo exclusive

An in-depth interview, including video footage, with astronaut Jim Lovell on his experiences with Apollo 8 and Apollo 13

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Asteroid Day

The truth about the impact threat facing Earth

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Death cries

NuSTAR captures possible “screams” from zombie stars

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Take the Universe with You!

Thanks for everything

MESSENGER's Mercury mission is finally complete

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Indonesian Islands Eclipse

Explore Bali and witness a total solar eclipse in March 2016 with Astronomy magazine and TravelQuest International

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Hubble at 25

How the space telescope changed the cosmos

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Stirring signal

Pulsing light may indicate supermassive black hole merger

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Join Astronomy's Aurora Adventure

Experience a once-in-a-lifetime northern lights tour with Astronomy magazine and TravelQuest International

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Getting closer!

New Horizons has captured its first color image of the Pluto system

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Uwingu Mars

Name a crater ... make an impact!

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Ch-ch-changes

For the first time, astronomers have detected atmospheric variability on a rocky planet outside the solar system

Learn more »

PICTURE OF THE DAYsee all »

Sharpless 2–73

Sh 2–73 lies in the constellation Hercules and was mistakenly included in the Sharpless catalog as an emission nebula. It has no association with the nearby hot star, however, which does not ionize the nebula’s gas. We now know that Sh 2–73 is simply a molecular cloud. With its relatively high galactic latitude, about 45°, the integrated light of the Milky Way illuminates the nebula. So, astronomers currently refer to Sh2-73 as part of the integrated flux nebula. (4-inch Takahashi FSQ-106ED refractor at f/5, SBIG STF-8300M CCD camera, LRGB image with exposures of 585, 330, 315 and 435 minutes, respectively)
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