Astronomy Picture of the Day: Cocoon Nebula Deep Field

Inside the Cocoon Nebula is a newly developing cluster of stars.

Astronomy Picture of the Day: Salt, Pepper, and Ice

There's a "camera" comet now moving across the sky.

Astronomy Picture of the Day: Cosmic Collision Forges Galactic Ring

How could a galaxy become shaped like a ring?

Astronomy Picture of the Day: A Solar Filament Erupts

What's happened to our Sun? Nothing very unusual -- it just threw a filament. Toward the middle of 2012, a long standing solar filament suddenly erupted into space producing an energetic Coronal Mass Ejection (CME).

Astronomy Picture of the Day: Mont Blanc, Meteor, and Milky Way

Snowy Mont Blanc is near the center of this atmospheric night skyscape.

Astronomy Picture of the Day: Ice Halos at Yellowknife

You've probably seen a circle around the Sun before. More common than rainbows, ice halos, like a 22 degree circular halo for example, can be easy to spot, especially if you can shade your eyes from direct sunlight.

Astronomy Picture of the Day: Comet, Clusters and Nebulae

Bright enough for binocular viewing Comet 21P / Giacobini-Zinner stands out, even in this deep telephoto mosaic of the star cluster and nebula rich constellation Auriga the Charioteer.

Astronomy Picture of the Day: Lunations

Our Moon's appearance changes nightly. As the Moon orbits the Earth, the half illuminated by the Sun first becomes increasingly visible, then decreasingly visible.

Astronomy Picture of the Day: Milky Way over Troll's Tongue

You have to take a long hike to see the Troll's Tongue -- ten hours over rocky terrain.

Astronomy Picture of the Day: Curiosity Vista from Vera Rubin Ridge

If you could stand on Mars -- what might you see? If you were NASA's Curiosity rover, just last month you would have seen the view from Vera Rubin Ridge, an intriguing rock-strewn perch on the side of Mount Sharp.

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