The origin of super-Earths and sub-Neptunes has been revealed in a system of four young planets that are dramatically losing ...

Over the years, passing spacecraft have observed mystifying weather patterns at the poles of Jupiter and Saturn. The two ...

New evidence of ancient rivers suggests Mars may have been a "blue planet," thanks to an ocean spanning its entire northern ...

This doesn’t mean Mars causes ice ages on its own. Orbital cycles are only part of the picture. Earth’s oceans, atmosphere, ...

Astronomers have captured the most dramatic view yet of a planet losing its atmosphere, watching the ultra-hot gas giant WASP ...

For decades, the number of planets seemed settled and unquestioned. Then definitions changed, discoveries multiplied, and certainty disappeared. The issue was never distance or size alone, but ...

"I don't think anyone's made this connection between the surface fluid pattern and the interior properties of these planets." ...

Using NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new ...

NASA has revealed a terrifying glimpse into our solar system 's grizzly fate. In five billion years, scientists believe the sun will collapse, leaving behind a shell of gas and dust. When this happens ...

Spacecraft orbiting the Red Planet have helped researchers map out an ancient coastline that surrounded a large ocean billions of years ago ...

I have been writing about the Giant Magellan Telescope for a long time. Nearly two decades ago, for example, I wrote that ...

Deep beneath the surface of distant exoplanets known as super-Earths, oceans of molten rock may be doing something ...