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Astronomy Picture of the Day: Gibbous Moon beyond Swedish Mountain

This is a gibbous Moon. More Earthlings are familiar with a full moon, when the entire face of Luna is lit by the Sun, and a crescent moon, when only a sliver of the Moon's face is lit.

Astronomy Picture of the Day: The Hill, The Moon, and Saturn

Last Sunday when the Moon was young its sunlit crescent hung low near the western horizon at sunset.

Astronomy Picture of the Day: Comet 46P/Wirtanen

Periodic Comet 46P/Wirtanen is now the brightest comet in the night sky, but too faint to be seen by eye.

Astronomy Picture of the Day: The Old Moon in the Young Moon's Arms

Tonight the Moon is young again, but this stunning image of a young Moon near the western horizon was taken just after sunset on October 10.

Astronomy Picture of the Day: Little Planet Lookout

Don't panic. This little planet projection looks confusing, but it's actually just a digitally warped and stitched, nadir centered mosaic of images that covers nearly 360x180 degrees.

Astronomy Picture of the Day: Mars in the Loop

This composite of images spaced some 5 to 9 days apart, from late April (bottom right) through November 5 (top left), traces the retrograde motion of ruddy-colored Mars through planet Earth's night sky.

Astronomy Picture of the Day: Lunar LOVE

A more creative search by a group of amateur astronomers in the Ehime Prefecture of Shikoku Island, Japan has found lunar L-O-V-E.

Astronomy Picture of the Day: R Leporis: A Vampire's Star

Better known as Hind's Crimson Star, R Leporis is a rare star in planet Earth's night sky. It's also a shocking shade of red.

Astronomy Picture of the Day: Airglow Borealis

The best known asterism in northern skies hangs over the Canadian Rockies in this mountain and night skyscape taken last week from Banff National Park.

Astronomy Picture of the Day: Hyperion: Largest Known Galaxy Proto-Supercluster

How did galaxies form in the early universe?

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