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Mass map

Astronomers using the Hubble Space Telescope have mapped the mass within a galaxy cluster more precisely than ever before

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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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Get started in the hobby!

Find your way around the night sky with our new app!

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Summer shower

The Southern Delta Aquariid meteor shower sparkles in late July

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Surprising shape

Nucleus of Rosetta target consists of two separate parts

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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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Why Join?

Get more from Astronomy.com!

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Reliving Apollo 11

EXCLUSIVE! How one small step became a giant leap

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Astronomy on DVD

Explore Astronomy magazine on DVD!

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3-D outburst

The first high-res model of the expanding cloud from Eta Carinae

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GET IT NOW!

Astronomy is available on the App Store!

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A must-have app!

Put the universe at your fingertips

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Black hole fireworks

Jets from M106's black hole reduce the available gas for star formation

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Faroe Islands Eclipse

Join Astronomy magazine and MWT Associates, Inc., March 14–23, 2015, as they take in totality from these unspoiled North Atlantic islands. Learn more »

Mass map

Astronomers using the Hubble Space Telescope have mapped the mass within a galaxy cluster more precisely than ever before

Learn more »

PICTURE OF THE DAYsee all »

A celestial joke

An elephant, a bat and a squid walked into a bar … This image shows the newly discovered “squid,” now known as OU4, a fragile blue object embedded in the red “bat” (Sharpless 2–129) at lower right. The elephant is above as IC 1396. The squid was discovered in May 2011 by amateur astronomer Nicolas Outters, and although not fully understood, it appears to be a giant, dim planetary nebula. (Canon 135mm f/2 lens set to f/2.5, FLI ML-8300 CCD camera, Hydrogen-alpha/Oxygen-III/RGB image with exposures of 210, 240, 60, 60, and 80 minutes, respectively)
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