Brrrr! Sunrise over a frozen marsh in Birch Bay, Washington.
Snow geese flying in front of the moon at sunset
Multi-layered lenticular cloud hovers near the Mount Discovery volcano in this photo taken from a NASA research flight over Antarctica.
People around the world saw the moon and Venus last night. They’ll be even closer tonight!
The young moon is back after sunset, passing near Venus in the next few evenings. The pale glow on the darkened portion of the moon is called “earthshine.”
Nearly two billion years of geologic history can be seen in the canyon, exposed by flowing water and the uplift of the Colorado Plateau.
Cassiopeia A – Cas A, for short – is the debris field left behind after a massive star exploded.
Has a remnant of Comet ISON survived the close brush with the sun?
The field of view of the SOHO mission’s LASCO C3 now fully shows Comet ISON.
Jet contrail shadows may appear to be cast by a low-altitude bright light shining upwards. In fact, this shadow is cast on clouds below the jet and its contrail.
There are rumors today that Comet ISON is breaking up as it nears its November 28 closest point to the sun. Here’s what a disintegrating comet looks like.
The Crab Nebula, by EarthSky Facebook friend Fernando Roquel Torres
Comet ISON is now inside the orbit of Mercury. It’s on the last leg of its journey sunward, a journey that began at least a million years ago.
People around the world last night saw Jupiter near the moon. One sky …
The evidence comes in the form of high-energy particles blasting out of the supermassive black hole at the center of our galaxy.
Except for a few bright stars, every speck of light in this image is an entire galaxy.
Awesome auroral display back in July, when the familiar green, magenta and purple colors changed to blue as they spiked.
Scientists at Scripps Institution of Oceanography in San Diego are unraveling the mechanisms behind the dazzling bioluminescent display of this tube worm.
The comet will be in a conspicuous place in the sky for the next several mornings, near the bright star Spica on the sky’s dome.
Proxima Centauri, one of three stars in the Alpha Centauri system, is our sun’s nearest known neighbor among the stars. It’s 4.22 light-years away.