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.
Cosmic Microwave Map Swirls Indicate Inflation
Did the universe undergo an early epoch of extremely rapid expansion? Such an inflationary epoch has been postulated to explain several puzzling cosmic attributes such as why our…
Warped Sky: Star Trails over Arches National Park
What's happened to the sky? A time warp, of sorts, and a digital space warp too. The time warp occurs because this image captured in a single frame a two and a half hour exposure…
The Antennae Galaxies in Collision
Two galaxies are squaring off in Corvus and here are the latest pictures . When two galaxies collide , the stars that compose them usually do not. That's because galaxies are…
Apollo 17 VIP Site Anaglyph
Get out your red/blue glasses and check out this stereo scene from Taurus-Littrow valley on the Moon! The color anaglyph features a detailed 3D view of Apollo 17's Lunar Rover in…
Polar Ring Galaxy NGC 2685
NGC 2685 is a confirmed polar ring galaxy - a rare type of galaxy with stars, gas and dust orbiting in rings perpendicular to the plane of a flat galactic disk. The bizarre…
Messier 63: The Sunflower Galaxy
A bright spiral galaxy of the northern sky, Messier 63 is about 25 million light-years distant in the loyal constellation Canes Venatici . Also cataloged as NGC 5055, the majestic…
The Sun Rotating
Does the Sun change as it rotates? Yes, and the changes can vary from subtle to dramatic. In the above time-lapse sequences, our Sun -- as imaged by NASA's Solar Dynamics…
In the Heart of the Rosette Nebula
In the heart of the Rosette Nebula lies a bright open cluster of stars that lights up the nebula. The stars of NGC 2244 formed from the surrounding gas only a few million years…
Gamma Rays from Galactic Center Dark Matter?
What is creating the gamma rays at the center of our Galaxy? Excitement is building that one answer is elusive dark matter . Over the past few years the orbiting Fermi Gamma-ray…
A Hole in Mars
What created this unusual hole in Mars? The hole was discovered by chance in 2011 on images of the dusty slopes of Mars' Pavonis Mons volcano taken by the HiRISE instrument aboard…
Mount Sharp on the Horizon
Get out your red/blue glasses (red for the left eye) and look out over this expansive martian landscape . The panoramic stereo view is composed of images from the roving…
A View from the Zone
Brilliant Venus and the central Milky Way rise in the early morning hours of March 1 in this sea and skyscape. The scene looks out from a beach at Sea Isle City, New Jersey, USA,…
NGC 1333 Stardust
NGC 1333 is seen in visible light as a reflection nebula , dominated by bluish hues characteristic of starlight reflected by dust. A mere 1,000 light-years distant toward the…
Globules in the Running Chicken Nebula
The eggs from this chicken may form into stars. The above pictured emission nebula, cataloged as IC 2944 , is called the Running Chicken Nebula for the shape of its greater…
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 large prominence, visible above , highlighted a highly active…
Habitable Worlds
Is Earth the only known world that can support life? In an effort to find life-habitable worlds outside our Solar System , stars similar to our Sun are being monitored for slight…
Martian Sunset
What would it be like to see a sunset on Mars? To help find out, the robotic rover Spirit was deployed in 2005 to park and watch the Sun dip serenely below the distant lip of…
NGC 7331 and Beyond
Big, beautiful spiral galaxy NGC 7331 is often touted as an analog to our own Milky Way . About 50 million light-years distant in the northern constellation Pegasus , NGC 7331 was…
Möbius Arch Moonrise
Only two days past full, February's moon shines through thin clouds, rising on the left in this fisheye night skyscape . The moonlight illuminates a weathered, rounded foreground…
Daytime Moon Meets Morning Star
Venus now appears as planet Earth's brilliant morning star standing above the eastern horizon before dawn. For most , the silvery celestial beacon rose in a close pairing with an…
Aurora over New Zealand
Sometimes the more you look at an image, the more you see. Such may be the case for this beautiful nighttime panorama taken last week in New Zealand . Visible right off, on the…
The Pleiades Deep and Dusty
The well known Pleiades star cluster is slowly destroying part of a passing cloud of gas and dust . The Pleiades is the brightest open cluster of stars on Earth's sky and can be…
The Cloudy Cores of Active Galaxies
What would it look like to travel to the center of an active galaxy? Most galactic centers are thought to house black holes millions of times more massive than our Sun. The spaces…
Cassini Spacecraft Crosses Saturn's Ring Plane
If this is Saturn, where are the rings? When Saturn's “appendages” disappeared in 1612, Galileo did not understand why. Later that century, it became understood that Saturn 's…
Viewing discoveries from 18 March 2014 through 23 February 2014.