Planets

A 90-mile-wide scar on the Martian landscape is potential "ground zero."

This first-of-its-kind discovery reveals a new category of ultrahot exoplanet, one so thoroughly cooked that your cast-iron skillet would bubble, turn to gas and boil out of the atmosphere.

Moons orbiting distant worlds have a new nickname, and it's even cuter than "moonmoon."

The year goes by quickly for this newfound asteroid.

The debate about 'Oumuamua's nature and origin continues.

The solar system is more than a row of nine circles. Try 18,000 of them.

A NASA mission to an ancient iron-nickel hunk has entered its final design phase, a key milestone on the way to reaching the distant destination in the mid-2020s.

The two planets appear to have cleared a wide gap in their young star's protoplanetary disk. This is the first-ever observation of this behavior.

Jupiter's magnetic field has changed since the 1970s, and now physicists think they know why it's happening.

The moon's farside has thicker crust and is made up of a number of craters, while its nearside is a land of open basins.

If humans mine one-eighth of the solar system's extraterrestrial resources, we could be doomed.

A nearby neutron star collision may have rained bling on our solar system when it was a baby.

New research suggests that the moon may have formed when a large planetoid fell into Earth's ancient magma ocean.

Ultima Thule is weird.

The first organisms may have evolved before the rocky planets formed.

More than 1 million species could go extinct, UN report finds.

Counting down the weirdest spots in our cosmic backyard.

Gonggong, Holle or Vili?

Astronomers found the remains of a dead planet orbiting a dead sun in a dead solar system. Happy spring!