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Cluster conundrum

Hubble observations cast further doubt on how globular clusters formed

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Sky Guide 2015

Monthly observing guide to the planets, meteor showers, and more

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Spooky alignment

The rotation axes of a sample of quasars are parallel to each other

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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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Minor planet map

Dawn mission images create geological maps of Vesta

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A Space Experience

Win a trip for four to the Kennedy Space Center Visitor Complex

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Get started in the hobby!

Find your way around the night sky with our app!

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Philae results

Mission scientists share the first data from a comet's surface

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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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Comet coverage

Take a look back at the Philae lander's historic few days

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Uwingu Mars

Name a crater ... make an impact!

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Get Started Tonight!

Sign up for Astronomy's five-part email series, Observing Essentials, and start making the most of every minute under the stars!

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2015 Calendar

View stunning images of stars, galaxies, and deep space wonders.

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Planet formation picture

ALMA reveals new detail in the planet-forming disk around a star

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Cluster conundrum

Hubble observations cast further doubt on how globular clusters formed

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PICTURE OF THE DAYsee all »

IC 1805

The Heart Nebula, also known as IC 1805, is a huge emission nebula in the constellation Cassiopeia the Queen. It lies some 7,500 light-years away and spans 200 light-years. (5.6-inch Telescope Engineering Company TEC-140 refractor at f/7, SXV-H9 CCD camera, Hydrogen-alpha/Oxygen-III/Sulfur-II/RGB image with exposures of 270, 360, 330, 16, 16, and 16 minutes, respectively)
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