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.
A Slice Through an Artificial Universe
We live in the era of humanity when most of our Universe is being mapped . To help understand these maps , astronomers computationally estimate the appearance of several possible…
The Doomed Dust Disk of NGC 7052
What created the dust disk in the center of NGC 7052, and what keeps it spinning? Although the disk might appear as a relatively tame “hubcap in space” , the unusual center of…
Edwin Hubble Discovers the Universe
No person in history has had greater impact in determining the extent of our universe than Edwin Hubble . From proving that other galaxies existed to proving that galaxies move…
Pioneer 10: The First 6 Billion Miles
Q: What was made by humans and is 6.5 billion miles away? A: Pioneer 10 - and last year was the 25th anniversary of its launch . More than 9.5 light-hours distant, Pioneer 10 is…
Good Morning Mars
Looking down on the Northern Hemisphere of Mars on June 1, the Mars Global Surveyor spacecraft's wide angle camera recorded this morning image of the red planet. Mars Global…
Cosmic Rays and Supernova Dust
Cosmic Rays are celestial high energy particles traveling at nearly the speed of light, which constantly bombard the Earth. Discovered during high altitude balloon flights in 1912…
The Sloan Digital Sky Survey Telescope
The Sloan Digital Sky Survey (SDSS) will soon begin. Pictured above is the 2.5-meter telescope poised to create the most ambitious sky map in the history of astronomy. SDSS will…
An Active Region of the Sun
The Sun is a busy place. This false-color image depicts an active region near an edge of the Sun . Hot plasma is seen exploding off the Sun's photosphere and traveling along loops…
NGC 4314: A Nuclear Starburst Ring
Is this old galaxy up to new tricks? The barred spiral galaxy NGC 4314 is billions of years old, but its appearance has changed markedly over just the past few millions of years.…
Giant Cluster Bends, Breaks Images
What are those strange blue objects? Many are images of a single, unusual, beaded, blue, ring-like galaxy which just happens to line-up behind a giant cluster of galaxies. Cluster…
Henize 70: A SuperBubble In The LMC
Stars with tens of times the mass of the Sun profoundly affect their galactic environment. Churning and mixing the interstellar gas and dust clouds they leave their mark in the…
Orion Nebula: The 2MASS View
Few astronomical sights excite the imagination like the nearby stellar nursery known as the Orion Nebula . The Nebula's glowing gas surrounds hot young stars at the edge of an…
SOHO's Twin Sungrazers
This four frame animation (courtesy D. Biesecker ) shows two comets arcing toward a fatal fiery encounter with the Sun. These discovery images were recorded by the LASCO…
NGC 6070: First Light for Sloan
The graceful spiral galaxy NGC 6070, 100 million light-years distant in the constellation Serpens, is helping astronomers celebrate "First Light" (the first test sky images) for…
Ice Cusps on Europa
Europa's icy crust has many unusual features. Pictured above is part of Europa 's southern hemisphere photographed by the Galileo spacecraft currently orbiting Jupiter . Europa is…
A Mars Glint
If aligned just right, even a planet can produce a glint . The above combined pictures of Mars make the red planet appear unusually elongated - Mars is really almost spherical .…
The Hubble Deep Field
Galaxies like colorful pieces of candy fill the Hubble Deep Field - humanity's most distant yet optical view of the Universe . The dimmest, some as faint as 30th magnitude (about…
M100: A Grand Design
Majestic on a truly cosmic scale, M100 is appropriately known as a Grand Design spiral galaxy . A large galaxy of over 100 billion or so stars with well defined spiral arms , it…
Neutrinos in the Sun
Neutrinos , along with things like electrons and quarks, are fundamental pieces of matter according to physicists' Standard Model . But neutrinos are hard to detect. Readily…
Comet SOHO and Nebulae in Orion
Astrophotographer Michael Horn captured this gorgeous view of comet SOHO in the dark night sky above Wandibindle, Queensland, Australia on May 23rd. On this date , comet SOHO was…
Martian Crater Shows Evidence of Dried Pond
Did a pond once exist in this Martian crater? Recent photographs by the spacecraft Mars Global Surveyor , currently in orbit around Mars , show features unusual for Mars yet…
NGC 6302: The Butterfly Nebula
The Butterfly Nebula is only thousands of years old. As a central star of a binary system aged, it threw off its outer envelopes of gas in a strong stellar wind . The remaining…
Solar Flares Cause Sun Quakes
An 11th magnitude quake has been recorded on the Sun , immediately following a moderate solar flare . The quake was the first ever recorded on the Sun , but only because…
Phobos: Doomed Moon of Mars
Phobos is doomed. Mars , the red planet named for the Roman god of war, has two tiny moons, Phobos and Deimos , whose names are derived from the Greek for Fear and Panic. These…
Viewing discoveries from 23 June 1998 through 31 May 1998.