Williams and another astronaut, Butch Wilmore, were supposed to stay in space for a week in 2024, but concerns about the ...

Veteran NASA astronaut Suni Williams announced her retirement Tuesday. Her extended mission to orbit due to the troubled Boeing Starliner test flight was her final foray.

NASA's Suni Williams — one of two astronauts stuck for months at the International Space Station — has retired.

Astronomers found an iron bar in the Ring Nebula that doesn't match any known stellar phenomenon. Scientists can't explain ...

Mars is famous for its volcanoes, canyons and ancient river valleys, but some of its most active geology happens in slow ...

Known as dinosaur stars for both their primeval nature and their immense size, Population III stars existed only when the ...

"One thing popped out as clear as anything, this previously unknown 'bar' of ionized iron atoms, in the middle of the ...

Do you know what connects Edwin Hubble’s theory for an expanding universe and Albert Einstein’s cosmological constant? The ...

NASA's Earth Observatory captured striking new satellite imagery showing iceberg A-23A which is now taking on an intense blue ...

Because the moon has less gravity than Earth does, time passes slightly differently there. This effect was first predicted by ...

Sometimes to truly study something up close, you have to take a step back. That's what Andrea Donnellan does. An expert in Earth sciences and seismology, she gets much of her data from a bird's-eye ...

Four astronauts departed from the I.S.S. about a month earlier than scheduled because a crew member, who was not identified, ...