See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Mars' missing atmosphere may be locked up in the planet's clay-rich ...

All evidence points to Mars having had a carbon dioxide-rich atmosphere billions of years ago, but insufficient carbonates in Martian soil challenge this theory. Now, a new study using data from ...

A phenomenon, thought impossible on Mars, compresses its atmosphere like squeezing a tube of toothpaste. Dubbed Zwan-Wolf, this effect was known on Earth but never observed elsewhere.

Mars does not have Earth's kind of magnetic shield, so it has often been treated as the solar system's more exposed world. It is a planet left to take the sun's blows with far less protection. But ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...

Mars wasn't always the cold desert we see today. There's increasing evidence that water once flowed on the red planet's surface, billions of years ago. And if there was water, there must also have ...

New research suggests Mars' missing atmosphere -- which dramatically diminished 3.5 billion years ago -- could be locked in the planet's clay-covered crust. Water on Mars could have set off a chain ...

Over more than a decade at Mars, the orbiter revealed how the solar wind strips away the planet’s atmosphere — and why the world lost its water.

Stand on the surface of Mars without a spacesuit and you would lose consciousness in roughly 15 seconds. Not because of the cold, though temperatures regularly plunge below minus 80 degrees Fahrenheit ...

Mars wasn’t always the cold desert we see today. There’s increasing evidence that water once flowed on the Red Planet’s surface, billions of years ago. And if there was water, there must also have ...