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Astronomy Picture of the Day
Updated: 6 hours 38 min ago

IC 4603: Reflection Nebula in Ophiuchius

6 hours 38 min ago

Why does this starfield photograph resemble an Why does this starfield photograph resemble an


Cave with Aurora Skylight

6 hours 38 min ago

Yes, but have you ever seen aurora from a cave? Yes, but have you ever seen aurora from a cave?


Spacecraft Rosetta Shows Comet has Two Components

6 hours 38 min ago

Why does this comet's nucleus have two components? Why does this comet's nucleus have two components?


A Solar Filament Erupts

6 hours 38 min ago

What's happened to our Sun? What's happened to our Sun?


Alicante Beach Moonrise

6 hours 38 min ago

In this beach and skyscape from Alicante, Spain, In this beach and skyscape from Alicante, Spain,


Ou4: A Giant Squid Nebula

6 hours 38 min ago

A mysterious, squid-like apparition, this nebula A mysterious, squid-like apparition, this nebula


ALMA Milky Way

6 hours 38 min ago

This alluring all-skyscape was taken 5,100 meters above sea level, This alluring all-skyscape was taken 5,100 meters above sea level,


3D Homunculus Nebula

Wed, 07/23/2014 - 00:42

3D Homunculus Nebula 3D Homunculus Nebula


The Moon Eclipses Saturn

Tue, 07/22/2014 - 03:42

What happened to half of Saturn? What happened to half of Saturn?


A Blue Bridge of Stars between Cluster Galaxies

Mon, 07/21/2014 - 06:42

Why is there a blue bridge of stars across the center of this galaxy cluster? Why is there a blue bridge of stars across the center of this galaxy cluster?


Auroras over Northern Canada

Sun, 07/20/2014 - 03:42

Auroras over Northern Canada Auroras over Northern Canada


Planetary Nebula NGC 2818 from Hubble

Sat, 07/19/2014 - 00:42

NGC 2818 is a beautiful NGC 2818 is a beautiful


SN 1006 Supernova Remnant

Fri, 07/18/2014 - 03:42

A new star, likely the brightest supernova A new star, likely the brightest supernova


Spotty Sunrise over Brisbane

Thu, 07/17/2014 - 00:42

In this composite cityscape, In this composite cityscape,


Noctilucent Clouds over London

Wed, 07/16/2014 - 03:42

This scene from the early morning hours This scene from the early morning hours


Gliese 832c: The Closest Potentially Habitable Exoplanet

Tue, 07/15/2014 - 06:42

This planet is only 16 light years away -- could it harbor life? This planet is only 16 light years away -- could it harbor life?


Iridescent Clouds over Thamserku

Mon, 07/14/2014 - 02:42

Why would a cloud appear to be different colors? Why would a cloud appear to be different colors?


J1502+1115: A Triple Black Hole Galaxy

Sun, 07/13/2014 - 06:42

Most galaxies contain one supermassive black hole -- why does this galaxy have three? Most galaxies contain one supermassive black hole -- why does this galaxy have three?


Manhattanhenge: A New York City Sunset

Sat, 07/12/2014 - 02:42

This coming Saturday, if it is clear, well placed New Yorkers can This coming Saturday, if it is clear, well placed New Yorkers can


M106 Across the Spectrum

Fri, 07/11/2014 - 05:42

The spiral arms of bright, active galaxy M106 sprawl through this The spiral arms of bright, active galaxy M106 sprawl through this