Clouds

 

Astronomy Picture of the Day: Messier 20 and 21

The beautiful Trifid Nebula, also known as Messier 20, is easy to find with a small telescope in the nebula rich constellation Sagittarius.

Astronomy Picture of the Day: Asperitas Clouds Over New Zealand

What kind of clouds are these? Although their cause is presently unknown, such unusual atmospheric structures, as menacing as they might seem, do not appear to be harbingers of meteorological doom.

Lunar eclipse from behind clouds

پانورامای ماهگرفتگی با حضور مریخ و کهکشان راه شیری ، در نمایی از کشتی به گل نشسته

Astronomy Picture of the Day: Noctilucent Clouds over Paris Fireworks

It's northern noctilucent cloud season -- perhaps a time to celebrate!

Astronomy Picture of the Day: A Northern Summer's Night

Near a summer's midnight a mist haunts the river bank in this dreamlike skyscape taken on July 3rd from northern Denmark.

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: Northern Lights and Noctilucent Clouds

Skies after the near-solstice sunset on June 17 are reflected in this calm lake.

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: Red Cloudbow over Delaware

What kind of rainbow is this? In this case, no rain was involved -- what is pictured is actually a red cloudbow.

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