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Astronomy Picture of the Day

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APOD

Dry Ice Sled Streaks on Mars: What creates these long and nearly straight grooves on Mars?

APOD Turns Eighteen

Delphinid Meteor Mystery: Over a five hour period last Tuesday morning,

Sharpless 115

Four Planet Sunset: You can see four planets in

Star Forming Region NGC 3582: What's happening in the NGC 3582 nebula?

The Large Magellanic Cloud in Ultraviolet: Where are the hottest stars in the nearest galaxies?

Messier Craters in Stereo: Many bright nebulae and star clusters in planet Earth's sky

NGC 6302: The Butterfly Nebula: The bright clusters and nebulae of planet Earth's night sky are often

M57: The Ring Nebula: Except for the rings

Orion Nebula in Oxygen, Hydrogen, and Sulfur: Few astronomical sights excite the imagination like the

Curiosity: Wheels on Mars: Could life ever have existed on Mars?

A Roll Cloud Over Uruguay: What kind of cloud is this?

The Milky Trail: Have you ever hiked the

The Eagle and The Swan: The Eagle Nebula and the Swan Nebula span

One Armed Spiral Galaxy NGC 4725: While most spiral galaxies, including our

NGC 6960: The Witch s Broom Nebula: Ten thousand years ago, before the dawn of

The Large Cloud of Magellan: The 16th century Portuguese navigator

Bird Sun Dog: Have you ever seen a little rainbow off to the side of the Sun?

PanSTARRS Anti Tail Grows: As planet Earth approached the plane of the

Lunar Corona over Cochem Castle

Caterpillar Moon: A close series of consecutive exposures are combined in this intriguing

Messier 109: Beautiful barred spiral

Red Sprite Lightning with Aurora: What's that in the sky?

The Red Rectangle Nebula from Hubble: How was the unusual Red Rectangle nebula created?

Blue Sun Bursting: Our Sun is not a giant blueberry.

Earths Richat Structure: What on Earth is that?

Comet PanSTARRS with Anti Tail: Once the famous

The Waterfall and the World at Night

Four X-class Flares: Swinging around the Sun's eastern limb on Monday,

Kepler's Supernova Remnant in X Rays: What caused this mess?

Partial Solar Eclipse with Airplane: It was just eight minutes after sunrise, last week, and already there were four thi...

Clouds, Birds, Moon, Venus: Sometimes the sky above can become quite a show.

Cape York Annular Eclipse: This week the shadow of the New Moon

Messier 77: Face on

Ring of Fire over Monument Valley: As the New Moon

Earth's Major Telescopes Investigate GRB 130427A: A tremendous explosion has occurred in the nearby universe and major t...

Galaxy Cove Vista: To see a vista like this takes patience, hiking, and a camera.

Tails of Comet Lemmon: What caused the interestingly intricate tails that Comet Lemmon displayed earlier this year?

A Supercell Thunderstorm Cloud Over Montana: Is that a spaceship or a cloud?

Hungarian Spring Eclipse: Last week, as the Sun set a Full Moon rose over

Horsehead: A Wider View: Combined image data from the massive,

Saturn Hurricane

Omega Centauri: The Brightest Globular Cluster: This huge ball of stars predates our Sun.

Humanity Explores the Solar System: What spacecraft is humanity currently using to explore our

Milky Way and Stone Tree: What's that next to the Milky Way?

A Raging Storm System on Saturn: It was one of the largest and longest lived storms ever recorded in our Solar System.

Sharp Stereo: Get out your

A Year on the Sun: Our solar system's

Lunar Eclipses: The dark, inner shadow of planet Earth is