Astronomers have identified an ultra-light exoplanet orbiting the star TOI-1453, located 250 light-years from Earth. While ...

Scientists are confident Mars was once abundant with water, as seen in massive flood-carved channels, ancient river valleys, ...

Astronomers discover a super-Earth and a sub-Neptune 250 light years away from our solar system. These planets offer a ...

Some estimates place these planets’ water content at around 50,000 times ... Neptune, for example, has an atmosphere made of ...

Mars may once have held enough water to fill oceans and form coastlines. The planet’s red dust contains water and likely formed in cold conditions.

Kepler can tell us how big a planet is, but it doesn't know what the planet is made of. And planets in the ... temperatures are consistent with liquid water is called the habitable zone.) ...

This puts Earth in a so-called "Goldilocks zone," where the temperature is just right for liquid water to exist on the surface. Our planet's atmosphere is mostly made of nitrogen. The next biggest ...

More than 3 billion years ago, Mars intermittently had liquid water on its surface. After the planet lost much of its ...

Water once existed in abundance of at the surface of Mars. How much of that water has been stored in the planet's crust is still unclear, according to a new analysis.