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Astronomy Picture of the Day: Star Trails and the Bracewell Radio Sundial

Sundials use the location of a shadow to measure the Earth's rotation and indicate the time of day.

Astronomy Picture of the Day: Centaurus A

Only 11 million light-years away, Centaurus A is the closest active galaxy to planet Earth.

Astronomy Picture of the Day: From the Galactic Plane through Antares

Behold one of the most photogenic regions of the night sky, captured impressively.

Astronomy Picture of the Day: Messier 24: Sagittarius Star Cloud

Unlike most entries in Charles Messier's famous catalog of deep sky objects, M24 is not a bright galaxy, star cluster, or nebula.

Astronomy Picture of the Day: Sigma Octantis and Friends

South pole star Sigma Octantis (of the constellation Octans) is on the left of this starry expanse spanning over 40 degrees across far southern skies.

Astronomy Picture of the Day: Galaxy in a Crystal Ball

A small crystal ball seems to hold a whole galaxy in this creative snapshot.

Astronomy Picture of the Day: Ancients of Sea and Sky

They may look like round rocks, but they're alive.

Astronomy Picture of the Day: Star Size Comparison 2

How big is our Sun compared to other stars? In dramatic and popular videos featured on YouTube, the relative sizes of planets, stars, and even the universe are shown from smallest to largest.

Astronomy Picture of the Day: The Clash of NGC 3256

Marked by an unusually bright central region, swirling dust lanes, and far flung tidal tails, peculiar NGC 3256 is the aftermath of a truly cosmic collision.

Astronomy Picture of the Day: Jupiter Season, Hawaiian Sky

Volcanic activity on the Big Island of Hawaii has increased since this Hawaiian night skyscape was recorded earlier this year.

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