When you buy through links on our articles, Future and its syndication partners may earn a commission. An illustration of Mars as a dry and arid world. But it wasn't always this way. Where did the red ...

A thin cloud that appears on Mars each year has baffled astronomers ever since it was first spotted, but it may be the result of a moisture-rich atmosphere that was thought impossible. Each winter, an ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Data from a retired ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Here’s what you’ll learn when you read this story: When NASA’s Perseverance rover ...