Browse NASA Astronomy Picture of the Day archive by date and media: Archive Discoveries
Browse the NASA APOD archive without needing the exact date first. Filter by media type and keep moving deeper into older images and videos.
Discovery in Twilight
As evening twilight faded on March 7, sky gazers around planet Earth enjoyed a beautiful pairing of young crescent Moon and brilliant planet Jupiter. Along with stars setting in…
The International Space Station Expands Again
The developing International Space Station (ISS) has changed its appearance again. In a recently completed rendezvous, the Space Shuttle orbiter Discovery , in its final flight ,…
Titan, Rings, and Saturn from Cassini
How thin are the rings of Saturn? Brightness measurements from different angles have shown Saturn's rings to be about one kilometer thick, making them many times thinner, in…
A Solar Prominence Eruption from SDO
One of the most spectacular solar sights is an erupting prominence. Two weeks ago, NASA's Sun-orbiting Solar Dynamic Observatory spacecraft imaged an impressively large prominence…
Asteroids in the Distance
Rocks from space hit Earth every day. The larger the rock, though, the less often Earth is struck. Many kilograms of space dust pitter to Earth daily. Larger bits appear initially…
Cooling Neutron Star
Supernova remnant Cassiopeia A (Cas A) is a comfortable 11,000 light-years away. Light from the Cas A supernova, the death explosion of a massive star, first reached Earth just…
NGC 6914 Nebulae
A dramatic study in contrasts, this colorful skyscape features stars, dust, and glowing gas in NGC 6914. The complex of nebulae lies some 6,000 light-years away, toward the…
Lunar Nearside
About 1,300 images from the Lunar Reconnaissance Orbiter spacecraft's wide angle camera were used to compose this spectacular view of a familiar face - the lunar nearside . But…
NGC 1499: The California Nebula
What's California doing in space? Drifting through the Orion Arm of the spiral Milky Way Galaxy, this cosmic cloud by chance echoes the outline of California on the west coast of…
Discovery Visits the Space Station
What's happening outside the space station? A space shuttle has docked. Five days ago, the space shuttle Discovery was launched to the International Space Station , carrying six…
Red Snow Moon Over Edmonton
What's hovering between those buildings? The Moon. The above image was taken two weeks ago as the full Snow Moon started to rise above Edmonton , Alberta , Canada . The odd…
Saturn's Hyperion: A Moon with Odd Craters
What lies at the bottom of Hyperion 's strange craters? Nobody's sure . To help find out, the robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in…
Shell Galaxies in Pisces
This colorful cosmic skyscape features a peculiar system of galaxies cataloged as Arp 227 some 100 million light-years distant. Swimming within the boundaries of the constellation…
NGC 4449: Close-up of a Small Galaxy
Grand spiral galaxies often seem to get all the glory. Their young, blue star clusters and pink star forming regions along sweeping spiral arms are guaranteed to attract…
NGC 1999: South of Orion
South of the large star-forming region known as the Orion Nebula, lies bright blue reflection nebula NGC 1999 . Also at the edge of the Orion molecular cloud complex some 1,500…
The Solar System from MESSENGER
If you looked out from the center of the Solar System, what would you see? Nearly such a view was taken recently from the MESSENGER spacecraft currently orbiting the Sun from the…
Star Size Comparisons
How big is our Sun compared to other stars? In a dramatic and popular video featured on YouTube, the relative sizes of planets and stars are shown from smallest to largest. The…
Milky Way Over Switzerland
What's visible in the night sky during this time of year? To help illustrate the answer, a beautiful land, cloud, and skyscape was captured earlier this month over Neuchtel ,…
Mammatus Clouds Over Olympic Valley
What's happened to these clouds? Normal cloud bottoms are flat because moist warm air that rises and cools will condense into water droplets at a very specific temperature, which…
Spiral Galaxy NGC 2841 Close Up
A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major . This sharp view of the gorgeous island universe shows off…
Planetary Nebula Project
Cast off by dying sunlike stars, planetary nebulae are a brief but glorious final phase of stellar evolution. The gaseous shrouds are ionized by an extremely hot central source,…
X-Class Flare
On Valentine's Day (ET) the Sun unleashed one of its most powerful explosions, an X-class flare . The blast was the largest so far in the new solar cycle. Erupting from active…
Comet Tempel 1 from Stardust-NeXT Spacecraft
No comet has ever been visited twice before. Therefore, the unprecedented pass of the Stardust-NeXT spacecraft near Comet Tempel 1 earlier this week gave humanity a unique…
The North America Nebula in Infrared
The North America Nebula can do what most North Americans cannot -- form stars. Precisely where in the nebula these stars are forming has been mostly obscured by some of the…
Viewing discoveries from 10 March 2011 through 15 February 2011.