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First exo-aurora

Astronomers discover powerful aurora beyond solar system

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Year of Pluto

Revelations of a distant world

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Pluto's alien atmosphere

New Horizons sees a ring of atmospheric haze on the backlit world.

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

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Heart of the matter

Pluto’s icy plains, pits, and mountains take shape

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Sign Up for Astronomy's five-part Observing Essentials email series!

Hubble at 25

How the space telescope changed the cosmos

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Ancient mega-Earth

Kepler finds a super-Earth around an aging Sun-like star

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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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Even more mountains

Pluto's heart is home to a second range of ice mountains

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Uwingu Mars

Name a crater ... make an impact!

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Exclusive podcast series

Editor David J. Eicher conducts extensive interviews with the world's top astrophysicists, planetary scientists, and cosmologists

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Take the Universe With You!

E.T. investment

Billionaire gives $100 million for new SETI search

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First exo-aurora

Astronomers discover powerful aurora beyond solar system

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PICTURE OF THE DAYsee all »

Spiral galaxy M109

M109 is a spiral galaxy in the constellation Ursa Major the Great Bear. It is the brightest galaxy in the M109 Group, a collection of some 50 galaxies. Other relatively bright members include NGC 3726, NGC 3953, and NGC 4088. The M109 Group lies approximately 60 million light-years away. (5.6-inch Telescope Engineering Company TEC-140 refractor at f/7, SBIG ST-8300M CCD camera, LRGB image with exposures of 540, 180, 180, and 180 minutes, respectively)
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