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Intermediate measurement

Astronomers have accurately measured — and thus confirmed the existence of — an intermediate-mass black hole.

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Supernova study

Chandra searches for trigger of January supernova in M82

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Experience a once-in-a-lifetime northern lights tour along the Norwegian coast and interior with Astronomy magazine and TravelQuest International.

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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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Gamma rays galore

Fermi finds four novae that produce gamma rays

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Mass map

Mapping the mass within a galaxy cluster more precisely than ever

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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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Seeing a halo

Hubble reveals an unexpected size and shape to the halo of Centaurus A

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Uwingu Mars

Name a crater ... make an impact!

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Intermediate measurement

Astronomers have accurately measured — and thus confirmed the existence of — an intermediate-mass black hole.

Learn more »

PICTURE OF THE DAYsee all »

The Crescent Nebula

The Crescent Nebula (NG 6888) is an emission nebula in the constellation Cygnus the Swan. It lies some 5,000 light-years from Earth. (16-inch RC Optical Systems Ritchey-Chrétien reflector at f/9, Apogee U16M CCD camera, Hydrogen-alpha/Oxygen-III/RGB image with 25 hours of Hydrogen-alpha exposures, 21 hours of Oxygen-III exposures, and a total of 5.5 hours of RGB exposures)
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