Astronomers have mapped the 3D structure of an alien planet's atmosphere for the first time, revealing a layered system of extreme winds.

YR4 has a 2% chance of hitting Earth in 2032. Astronomers are tracking it to refine estimates of its size and orbit to see ...

If a space rock of this size were to strike Earth, it could cause significant regional damage — similar to the 2013 ...

New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead ...

The likelihood of 2024 YR4 colliding with the our planet in 2032 have ticked up to over 3 percent. Is it time to start ...

A massive 120-foot asteroid, named 2025 CY3, is set to make a close approach to Earth this weekend. Hurtling through space at ...

Two weeks ago, when Ars first wrote about the asteroid, designated 2024 YR4, NASA's Center for Near Earth Object Studies ...

Saturn’s rings are an arresting sight even through modest telescopes. The planet is made mostly of hydrogen and helium whereas the rings are billions of pieces of mostly bright-white water ice and ...

That’s not even close to the size of the “planet-killer” asteroid that slammed into Earth 66 million years ago and led to the extinction of dinosaurs. That one was estimated to be about 6.2 miles (10 ...

A vast construction site southwest of Beijing has drawn the scrutiny of U.S. intelligence services, which suspect that China ...

YR4 has a 2.3% chance of hitting Earth in the year 2032. But according to new estimates, it may have an even smaller chance ...

Chinese scientists have been continuously observing an asteroid that may collide with Earth in 2032 since early January, ...