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's Cloud
The space shuttle orbiter Discovery is now docked with the International Space Station , some 350 kilometers above planet Earth . Last Monday, its launch to orbit was a beautiful…
Venus and Mercury in the West
In this twilight skyview, a windmill stands in silent witness to a lovely pairing of planets in the west. The picture was recorded on April 5 from Gallegos del Campo, Zamora,…
A Fox Fur, a Unicorn, and a Christmas Tree
What do the following things have in common: a cone, the fur of a fox, and a Christmas tree? Answer: they all occur in the constellation of the unicorn ( Monoceros ). Pictured…
Prometheus Remastered
What does Saturn's shepherd moon Prometheus really look like? The raw images from the robotic Cassini spacecraft's January flyby of the small moon showed tantalizing clues on…
The Belt of Venus over the Valley of the Moon
Although you've surely seen it, you might not have noticed it. During a cloudless twilight , just before sunrise or after sunset , part of the atmosphere above the horizon appears…
NGC 602 and Beyond
Near the outskirts of the Small Magellanic Cloud , a satellite galaxy some 200 thousand light-years distant, lies 5 million year young star cluster NGC 602. Surrounded by natal…
Serene Paraselene
Nestled in the Austrian Alps, frozen Lake Ossiach stretches across the foreground of this serene view. Recorded on March 1, the night sky includes a nearly full Moon and bright…
Evidence Mounts for Water on the Moon
In 2009, space missions revealed tantalizing signs of water on or near the lunar surface, once thought of as a dry and desolate environment . But researchers are now offering this…
Millions of Stars in Omega Centauri
Featured in the sharp telescopic image, globular star cluster Omega Centauri (NGC 5139) is some 15,000 light-years away and 150 light-years in diameter. Packed with about 10…
Unusual Starburst Galaxy NGC 1313
Why is this galaxy so discombobulated? Usually, galaxies this topsy-turvy result from a recent collision with a neighboring galaxy. Spiral galaxy NGC 1313 , however, appears to be…
Moonset Over Pleasant Bay
It was a sky for the imagination. In the early evening last week, the sky illuminating the unaided eye was perhaps even more illuminating to the mind's eye. The unaided eye saw…
M16: Pillars of Creation
It has become one of the most famous images of modern times. This image , taken with the Hubble Space Telescope in 1995, shows evaporating gaseous globules (EGGs) emerging from…
Hesiodus Sunrise Ray
Stark shadows of mountains and crater walls stand out along the lunar terminator, or shadow line between night and day, in this telescopic image. Of course, if viewed from the…
Young Moon and Sister Stars
A young crescent Moon shares the western sky with sister stars of the Pleiades cluster in this pretty, evening skyscape recorded on the March equinox from San Antonio, Texas. In…
NGC 2442: Galaxy in Volans
Distorted galaxy NGC 2442 can be found in the southern constellation of the flying fish , (Piscis) Volans . Located about 50 million light-years away, the galaxy's two spiral arms…
Galaxy Wars: M81 versus M82
On the right, surrounded by blue spiral arms, is spiral galaxy M81 . On the left, marked by red gas and dust clouds, is irregular galaxy M82 . This stunning vista shows these two…
Reinvigorated Sun and Prominence
Dramatic prominences can sometimes be seen looming just beyond the edge of the sun. Such was the case last week as a giant prominence, visible above on the right, highlighted a…
The Nearby Milky Way in Cold Dust
What shapes the remarkable dust tapestry of the nearby Milky Way Galaxy? No one knows for sure. The intricate structures, shown above , were resolved in new detail recently in a…
Equinox + 1
Twice a year, at the Spring and Fall equinox , the Sun rises due east. In an emphatic demonstration of this celestial alignment , photographer Joe Orman recorded this inspiring…
Zodiacal Light Vs. Milky Way
Ghostly Zodiacal light, featured near the center of this remarkable panorama, is produced as sunlight is scattered by dust in the Solar System's ecliptic plane . In the weeks…
The Seagull and the Duck
Seen as a seagull and a duck, these nebulae are not the only cosmic clouds to evoke images of flight. But both are winging their way across this broad celestial landscape,…
Fermi Catalogs the Gamma-ray Sky
What shines in the gamma-ray sky? The most complete answer yet to that question is offered by the Fermi Gamma-ray Space Telescope's first all-sky catalog . Fermi's sources of…
Phobos from Mars Express
Why is this small object orbiting Mars? The origin of Phobos , the larger of the two moons orbiting Mars, remains unknown. Phobos and Deimos appear very similar to C-type…
Detailed View of a Solar Eclipse Corona
Only in the fleeting darkness of a total solar eclipse is the light of the solar corona easily visible. Normally overwhelmed by the bright solar disk, the expansive corona , the…
Viewing discoveries from 8 April 2010 through 16 March 2010.