An asteroid, called 2025 TF, safely passed within roughly 250 miles (400 km) of our planet on Sept. 30 after surprising ...

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining ...

On October 6 1995, at a scientific meeting in Florence, Italy, two Swiss astronomers made an announcement that would transform our understanding of the universe beyond our solar system. Michel Mayor ...

The known universe is full of shockingly huge things. Here are the largest planets, stars, galaxies, and structures we've observed in the universe so far.

EU researchers are developing powerful new telescopes to help uncover Earth-like planets around distant stars and advance the search for extraterrestrial life.

Previous studies pointed to liquid at the heart of the red planet. The latest findings indicate the inner core, while small, ...

The hunt for Earth-like planets orbiting other stars is inherently challenging. Earth is relatively small in size and low in mass, and it orbits far enough from the Sun that liquid surface water is ...

Recent research indicates Mercury is shrinking, with its radius decreasing by 2.7 to 5.6 kilometers due to core cooling. This contraction forms thrust faults and scarps on the surface. A new ...

Another really weird planet orbiting another star has been found, and it’s a world of extremes: The orbital period—its year—is only 8½ hours long, and it’s so hot it must have a molten surface of ...

Scientists detect a solid inner core on Mars for the first time, revealing a new chapter in planetary evolution.

The universe is vast — possibly even infinite — and in the scheme of things, our planet is tiny. Even in our own solar system, Earth is dwarfed by gas giants like Jupiter. But are there bigger planets ...

A new paper suggests Saturn’s core is more like a fluid than a solid, and makes up more of the planet’s interior than we thought. With its massive rings stretching out 175,000 miles in diameter, ...