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.
Phoebe: Comet Moon of Saturn
Was Saturn's moon Phoebe once a comet? Images from the robotic Cassini spacecraft taken two years ago when entering the neighborhood of Saturn indicate that Phoebe may have…
Plato and the Lunar Alps
The dark-floored, 95 kilometer wide crater Plato (top) and sunlit peaks of the lunar Alps are highlighted in this sharp digital mosaic of the Moon's surface . While the Alps of…
M8: The Lagoon Nebula
This beautiful cosmic cloud is a popular stop on telescopic tours of the constellation Sagittarius . Eighteenth century cosmic tourist Charles Messier cataloged the bright nebula…
NGC 1309 and Friends
A gorgeous spiral galaxy some 100 million light-years distant, NGC 1309 lies on the banks of the constellation Eridanus . NGC 1309 spans about 30,000 light-years, one third the…
The Great Basin on Tethys
Some moons wouldn't survive the collision. Tethys , one of Saturn's larger moons at about 1000 kilometers in diameter, survived the collision, but sports today the expansive…
UB 313: Larger than Pluto
What do you call an outer Solar System object that is larger than Pluto? Nobody is yet sure. The question arose recently when 2003 UB313 , an object currently twice as far out as…
The N44 Superbubble
What created this gigantic hole? The vast emission nebula N44 in our neighboring galaxy the Large Magellanic Cloud has a large, 250 light-year hole and astronomers are trying to…
A Sun Pillar in Red and Violet
Sometimes the unknown is beautiful. In 2000 February near Lake Tahoe, Nevada , two amateur photographers noticed an unusual red column of light rise mysteriously from a setting…
Shadow Set
A nearly full Moon and planet Earth's shadow set together in this scene captured on January 13th from snowy Mt. Jelm, home of the Wyoming Infrared Observatory . For early morning…
Cosmic Tornado HH49/50
Light-years in length, this cosmic tornado is actually a powerful jet cataloged as HH (Herbig-Haro) 49/50 blasting down from the top of a Spitzer Space Telescope view . Though…
Thor's Helmet in H-Alpha
Near picture center, the helmet-shaped structure with wing-like appendages is popularly called Thor's Helmet . Cataloged as NGC 2359, the striking nebula is located about 15,000…
Venus Just After Sunset
Is that Venus or an airplane? A common ponderable for sky enthusiasts is deciding if that bright spot near the horizon is the planet Venus . Usually, an airplane will show itself…
Huygens on Titan Illustrated
If you could stand on Titan, what might you see? About one year ago the robotic Huygens probe landed on the enigmatic moon of Saturn and sent back the first ever images from…
NGC 1999: South of Orion
South of the large star-forming region known as the Orion Nebula, lies bright blue reflection nebula NGC 1999 . The nebula is marked with a dark inverted T-shape at the lower left…
Volcano and Aurora in Iceland
Sometimes both heaven and Earth erupt. In Iceland in 1991, the volcano Hekla erupted at the same time that auroras were visible overhead. Hekla , one of the most famous volcanoes…
Saturn in the Hive
If you can find Saturn in tonight's sky, then you can also find M44 , popularly known as the Beehive star cluster. In fact, with a pair of binoculars most casual skygazers should…
A New Storm on Saturn
Presently at opposition in planet Earth's sky, Saturn is well placed for telescopic observations . On Wednesday two amateur astronomers took full advantage of the situation from…
An Unusual Two-Toned Rock on Mars
How did this unusual Martian rock form? The atypical two-toned rock, visible in the lower right of the above image , was photographed a few days ago by the robotic Spirit rover…
The Expanding Light Echoes of SN 1987A
Can you find supernova 1987A? It isn't hard -- it occurred at the center of the expanding bullseye pattern. Although this stellar detonation was first seen almost two decades ago,…
New Horizons Launches to Pluto
Destination: Pluto. The New Horizons spacecraft roared off its launch pad at Cape Canaveral in Florida , USA last week toward adventures in the distant Solar System . The craft is…
The LMC Galaxy in Glowing Gas
What goes on inside of a galaxy? To help find out, astronomers from the Magellanic Cloud Emission Line Survey team imaged our neighboring LMC galaxy in spectacular detail and…
D. rad Bacteria: Candidate Astronauts
These bacteria could survive on another planet. In an Earth lab, Deinococcus radiodurans (D. rad) survive extreme levels of radiation , extreme temperatures, dehydration , and…
Apollo 12: Self-Portrait
In November of 1969, Apollo 12 astronaut-photographer Charles “Pete” Conrad recorded this masterpiece while documenting colleague Alan Bean's lunar soil collection activities on…
LL Ori and the Orion Nebula
This esthetic close-up of cosmic clouds and stellar winds features LL Orionis , interacting with the Orion Nebula flow. Adrift in Orion's stellar nursery and still in its…
Viewing discoveries from 12 February 2006 through 20 January 2006.