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A Triangular Shadow of a Large Volcano

Why does the shadow of this volcano look like a triangle?

Astronomy Picture of the Day: Messier 2

After the Crab Nebula, M1, this giant star cluster is the second entry in 18th century astronomer Charles Messier's famous list of things that are not comets.

سحابی پلیکان و آمریکای شمالی در پالت هابل


Astronomy Picture of the Day: Lunar Eclipse over Cologne Cathedral

Why would a bright full Moon suddenly become dark? Because it entered the shadow of the Earth.

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.

M33 Galaxy

a close up view of brilliant galaxy

Astronomy Picture of the Day: Aurora around Saturn's North Pole

Are Saturn's auroras like Earth's? To help answer this question, the Hubble Space Telescope and the Cassini spacecraft monitored Saturn's North Pole simultaneously during Cassini's final orbits around the gas giant in September 2017.

supergiant Antares and Rho ophiuchi


نفرات برتر مسابقه عکاسی از طولانی ترین خسوف قرن مشخص شدند.

برندگان مسابقه طولانی ترین خسوف قرن مشخص شدند.

Astronomy Picture of the Day: Total Solar Eclipse Shadow from a Balloon

Where were you during the Great American Eclipse of 2017?

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