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.
Halloween and the Wizard Nebula
Halloween's origin is ancient and astronomical. Since the fifth century BC, Halloween has been celebrated as a cross-quarter day , a day halfway between an equinox (equal day /…
Reflections of the Ghost Nebula
Do any shapes seem to jump out at you from this interstellar field of stars and dust? The jeweled expanse, filled with faint, starlight-reflecting clouds, drifts through the night…
A Partial Lunar Eclipse
What's happened to the Moon? Within the last day, part of the Moon moved through the Earth's shadow . This happens about once or twice a year , but not every month since the…
The Ghosts of Gamma Cas
Gamma Cassiopeiae shines high in northern autumn evening skies. It's the brightest spiky star in this telescopic field of view toward the constellation Cassiopeia. Gamma Cas…
Encke and the Tadpoles
History's second known periodic comet is Comet Encke (2P/Encke) . As it swings through the inner Solar System, Encke's orbit takes it from an aphelion, its greatest distance from…
Orionids in Taurus
History's first known periodic comet, Comet Halley (1P/Halley) , returns to the inner Solar System every 76 years or so. The famous comet made its last appearance to the naked-eye…
Gone in 60 Seconds: A Green Flash Sunset
In 60 seconds, this setting Sun will turn green. Actually, the top of the Sun already appears not only green, but wavey -- along with all of its edges. The Sun itself is unchanged…
Arp 87: Merging Galaxies from Hubble
This dance is to the death. As these two large galaxies duel, a cosmic bridge of stars, gas, and dust currently stretches over 75,000 light-years and joins them. The bridge itself…
Moon Io from Spacecraft Juno
There goes another one! Volcanoes on Jupiter 's moon Io keep erupting. To investigate, NASA 's robotic Juno spacecraft has begun a series of visits to this very strange moon. Io…
Ghost Aurora over Canada
What does this aurora look like to you? While braving the cold to watch the skies above northern Canada early one morning in 2013, a most unusual aurora appeared. The aurora…
Quarter Moons
Half way between New Moon and Full Moon is the Moon's first quarter phase . That's a quarter of the way around its moonthly orbit. At the first quarter phase, half the Moon's…
Galaxies and a Comet
Galaxies abound in this sharp telescopic image recorded on October 12 in dark skies over June Lake, California. The celestial scene spans nearly 2 degrees within the boundaries of…
A Sunrise at Sunset Point
This timelapse series captured on October 14 is set against the sunrise view from Sunset Point, Bryce Canyon, planet Earth . Of course on that date the New Moon caught up with the…
Dust and the Western Veil Nebula
It's so big it is easy to miss. The entire Veil Nebula spans six times the diameter of the full moon , but is so dim you need binoculars to see it. The nebula was created about…
PDS 70: Disk, Planets, and Moons
It's not the big ring that's attracting the most attention. Although the big planet-forming ring around the star PDS 70 is clearly imaged and itself quite interesting. It's also…
Eclipse Rings
She knew everything but the question. She was well aware that there would be a complete annular eclipse of the Sun visible from their driving destination: Lake Abert in Oregon .…
An Eclipse Tree
Yes, but can your tree do this? If you look closely at the ground in the featured image, you will see many images of yesterday's solar eclipse -- created by a tree. Gaps between…
Circular Sun Halo
Want to see a ring around the Sun? It's easy to do in daytime skies around the world. Created by randomly oriented ice crystals in thin high cirrus clouds, circular 22 degree…
Hydrogen Clouds of M33
Gorgeous spiral galaxy Messier 33 seems to have more than its fair share of glowing hydrogen gas. A prominent member of the local group of galaxies, M33 is also known as the…
Mu Cephei
Mu Cephei is a very large star. An M-class supergiant some 1500 times the size of the Sun, it is one of the largest stars visible to the unaided eye, and even one of the largest…
NGC 1097: Spiral Galaxy with Supernova
What's happening in the lower arm of this spiral galaxy? A supernova . Last month, supernova SN 2023rve was discovered with UAE 's Al-Khatim Observatory and later found to be…
Hidden Orion from Webb
The Great Nebula in Orion has hidden stars. To the unaided eye in visible light, it appears as a small fuzzy patch in the constellation of Orion . But this image was taken by the…
A Distorted Sunrise Eclipse
Yes, but have you ever seen a sunrise like this? Here, after initial cloudiness, the Sun appeared to rise in two pieces and during a partial eclipse in 2019, causing the…
Plane, Clouds, Moon, Spots, Sun
What's that in front of the Sun? The closest object is an airplane , visible just below the Sun's center and caught purely by chance. Next out are numerous clouds in Earth's…
Viewing discoveries from 31 October 2023 through 8 October 2023.