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.
Magnetars In The Sky
Indicated on this infrared image of the galactic center region are positions of candidate magnetars -- believed to be the strongest magnets in the galaxy. Classified by observers…
What the Hubble Saw
In this striking 41 inch by 38 inch quilt, astronomy enthusiast Judy Ross has interpreted some of the Hubble Space Telescope's best galactic and extragalactic vistas. Featured in…
A Radar View of Titan
Where are Titan's craters? Throughout our Solar System 's five billion-year history, dangerous rocks and chunks of ice have continually slammed into planets and moons - usually…
Leonid Meteors Streak
The 2004 Leonids meteor shower had its ups and downs. Although average rates were significantly less than many previous years, as expected, at least two unexpected “…
Swift Launches
Where do gamma ray bursts occur? To help find out, NASA launched the Swift satellite on Saturday, as pictured above . What Swift is designed to do better than any previous…
Spiral Galaxies in Collision
Billions of years from now, only one of these two galaxies will remain. Until then, spiral galaxies NGC 2207 and IC 2163 will slowly pull each other apart, creating tides of…
Stereo Phobos
Get out your red/blue glasses and float next to Phobos, grooved moon of Mars! Also featured in yesterday's episode , the image data from the Mars Express High Resolution Stereo…
Phobos: Doomed Moon of Mars
This moon 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.…
A Sharper View of a Tilted Planet
These sharp views of tilted gas giant Uranus show dramatic details of the planet's atmosphere and ring system . The remarkable ground-based images were made using a near-infrared…
Aurora Over Wisconsin
The auroral displays of the past week are being reported as some of the most beautiful in memory . In particular, impressive auroral bands fanned out over much of eastern North…
Sagittarius Dwarf Irregular Galaxy
How old is this galaxy? The nearby Local Group galaxy dubbed the Sagittarius Dwarf Irregular Galaxy (SagDIG) is not only very small but also has relatively few elements more…
Burns Cliff on Mars
The majestic walls of Endurance Crater contain layers of clues about the ancient past of Mars . In fact, the deeper the layer, the older the clue. The particular crater wall…
Leonids Above Torre de la Guaita
The 1999 Leonids Meteor Shower came to an impressive crescendo. Observers in Europe observed a sharp peak in the number of meteors visible around 0210 UTC during the early morning…
Moon Over Shiraz
Early morning risers around the world have enjoyed the sight of bright planets in this week's predawn skies - further enhanced by the celestial spectacle of the waning crescent…
Missouri's Green Ribbon Sky
The critics rave - “Amazing!”, “Unbelievable!”, “The best I've ever seen!” They aren't talking about a movie, though . Instead, even casual sky critics are remarking on November's…
Pastel Planet, Triple Eclipse
This false-color image of banded gas giant Jupiter shows a triple eclipse in progress on March 28 - a relatively rare event, even for a large planet with many moons. Captured by…
Leo A: Nearby Dwarf Irregular Galaxy
Why isn't this small galaxy simple? The above image and contemporary observations of small nearby galaxy Leo A were supposed to show it has a simple structure. Now Leo A is known…
A Full Sky Multicolored Auroral Corona
On some nights the sky is the most interesting show in town. This fisheye picture captures a particularly active and colorful auroral corona that occurred two days ago over…
Jupiter and Venus at Sunrise
What are those bright objects in the morning sky ? Early morning dog walkers, among many others across our world's Northern Hemisphere, have likely noticed tremendously bright…
The Galactic Center in Infrared
The center of our Galaxy is a busy place. In visible light , much of the Galactic Center is obscured by opaque dust . In infrared light , however, dust glows more and obscures…
X-Rays from the Galactic Core
Using the orbiting Chandra X-ray Observatory, astronomers have taken this long look at the core of our Milky Way galaxy, some 26,000 light-years away. The spectacular false-color…
Supernova Remnant Imaged in Gamma Rays
Gamma rays are the most energetic form of light . With up to a billion times the energy of ordinary “medical” x-rays , they easily penetrate telescope lenses and mirrors, making…
NGC 7023: The Iris Nebula
Like delicate cosmic petals, these clouds of interstellar dust and gas have blossomed 1,300 light-years away in the fertile star fields of the constellation Cepheus . Sometimes…
A Time-Lapse Lunar Eclipse
During last week's lunar eclipse , our Moon appeared to disappear. As the Earth moved between the Moon and the Sun, the Earth's shadow fell on the moon, making it quite dark . In…
Viewing discoveries from 26 November 2004 through 3 November 2004.