Purple aurora

Very beautiful aurora over Östersund, Sweden. We love aurora season!

NROA astronomers pin down distance to Pleiades stars

National Radio Astronomy Observatory astronomers used a tried-and-true method - stellar parallax - to resolve a controversy over the Pleiades' distance.

Snowfall ahead in a warmer world, says study

An MIT study finds big snowstorms will still occur in the Northern Hemisphere despite global warming.

Report: Summer ozone to get much worse in next 35 years

A new report warns of a 70% increase in the number of days with unhealthy summertime ozone levels by the year 2050.

Sea clouds at sunset

Isn't this gorgeous? Clouds at sunset over Italy's Ligurian Sea by Maranatha.it Photography.

Yellowstone supervolcano would cover North America in ash

It's highly unlikely a supervolcano will erupt at Yellowstone National Park. But, says a new study, if one did, volcanic ash would cover North America.

Evidence for supernovas near Earth

A NASA sounding rocket has confirmed that the solar system is inside an ancient supernova remnant. Life on Earth survived despite the nearby blasts.

Best view yet of colliding galaxies in distant universe

Using telescopes on the ground and in space, astronomers have obtained the best-yet view of a galaxy collision that happened when the universe was half its current age.

Testing a space rover under Alaskan ice

Scientists test a device on an Alaska glacier that could be used to explore an icy moon of Jupiter.

Milky Way over Utah, and a moonlit blue hour

A crescent moon - just set below high, hardened sand dunes in Goblin Valley State Park in Utah - creates a kind of "blue hour" glow in the sky.