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Astronomy Picture of the Day
Updated: 5 hours 58 min ago

Galaxies in Pegasus

Fri, 10/24/2014 - 02:42

Galaxies in Pegasus Galaxies in Pegasus


Sunspot Group AR 2192 Crackles

Fri, 10/24/2014 - 02:42

One of the largest sunspot groups in recent years is now crossing the Sun. One of the largest sunspot groups in recent years is now crossing the Sun.


Mimas: Small Moon with a Big Crater

Fri, 10/24/2014 - 02:42

Whatever hit Mimas nearly destroyed it.  Whatever hit Mimas nearly destroyed it.


Comet Siding Spring Passes Mars

Fri, 10/24/2014 - 02:42

Yesterday, a comet passed very close to Mars. Yesterday, a comet passed very close to Mars.


Comet McNaught Over New Zealand

Fri, 10/24/2014 - 02:42

Comet McNaught was perhaps the most photogenic comet of modern times -- from Earth.  Comet McNaught was perhaps the most photogenic comet of modern times -- from Earth.


Melotte 15 in the Heart

Fri, 10/24/2014 - 02:42

Cosmic clouds form Cosmic clouds form


AR 2192: Giant on the Sun

Fri, 10/24/2014 - 02:42

As you (safely!) watched the progress of yesterday's partial solar As you (safely!) watched the progress of yesterday's partial solar


Messier 6 and Comet Siding Spring

Thu, 10/23/2014 - 06:42

Messier 6 and Comet Siding Spring Messier 6 and Comet Siding Spring


Rosetta's Selfie

Wed, 10/22/2014 - 02:42

Rosetta's Selfie Rosetta's Selfie


Mysterious Changing feature on Titan

Tue, 10/21/2014 - 05:42

What is that changing object in a cold What is that changing object in a cold


Auroral Corona over Norway

Mon, 10/20/2014 - 01:42

Higher than the highest mountain lies the realm of the aurora. Higher than the highest mountain lies the realm of the aurora.


Sprite Lightning in Slow Motion

Sun, 10/19/2014 - 11:42

What causes sprite lightning? What causes sprite lightning?


The Helix Nebula from Blanco and Hubble

Sat, 10/18/2014 - 02:42

How did a star create the How did a star create the


Eclipse at Moonrise

Fri, 10/17/2014 - 05:42

Eclipse at Moonrise Eclipse at Moonrise


Moons at Opposition

Thu, 10/16/2014 - 02:42

Moons at Opposition Moons at Opposition


Eclipse at Moonset

Wed, 10/15/2014 - 05:42

Eclipse at Moonset Eclipse at Moonset


NGC 6823: Cloud Sculpting Star Cluster

Tue, 10/14/2014 - 02:42

Star cluster NGC 6823 is slowly turning gas clouds into stars.  Star cluster NGC 6823 is slowly turning gas clouds into stars.


From the Temple of the Sun to the Temple of the Moon

Mon, 10/13/2014 - 05:42

What connects the Sun to the Moon? What connects the Sun to the Moon?


Space Station Detector Finds Unexplained Positron Excess

Sun, 10/12/2014 - 01:42

Where did all these high energy positrons come from? Where did all these high energy positrons come from?


A Total Lunar Eclipse Over Tajikistan

Sat, 10/11/2014 - 04:42

If the full Moon suddenly faded, what would you see? If the full Moon suddenly faded, what would you see?