Circumzenithal arcs have been described as upside-down rainbows or "a grin in the sky." They're wonderful! See photos here.

Physicists at MIT analyzed data from earlier experiments in particle accelerators, in order to probe the workings of the strong nuclear force that operates inside atoms. Their work sheds light on this force - one of the 4 fundamental forces of nature - and also illuminates the structure of a neutron star’s core.

Were dinosaurs warm-blooded or cold-blooded? According to a new study that analyzed the chemistry of dinosaur eggshells, the answer is "warm."

A new study by researchers at Cambridge University suggests that the giant exoplanet K2-18b - a mini-Neptune - may be more potentially habitable than previously thought.

For the first time in more than 4 years, NASA is now accepting applications for future astronauts. Aspiring moon to Mars explorers have until March 31 to apply.

An intense storm and lake-effect snow walloped upstate New York - especially rural areas in western New York - in late February 2020. On the shores of Lake Erie, the storm created a dramatic display of thick, windblown ice on homes and buildings.

On March 1 and 2, 2020, the waxing moon is near the bright red star Aldebaran in Taurus the Bull, and the Pleiades star cluster. Dazzling Venus is nearby.

NASA has issued a public challenge where you can help design a critical sensor that would be needed for a future rover on Venus.

Scientists studying a distant galaxy cluster have discovered the biggest explosion seen in the universe since the Big Bang.

This video tracks a telescopic view of Venus from when it came into easy view in our evening sky - around October 2019 - to May 2020. It shows how Venus wanes in phase as the planet's disk size increases, and explains why.