They're not actual spiders, of course, but rather strange geological features.

As humanity sets its sights on long-duration missions to the moon, Mars, and beyond, keeping astronauts healthy will be as critical as building rockets or habitats. A new paper appearing in npj Microgravity explores the possibilities of synthetic biology in accomplishing this.

On Wednesday, Sotheby’s will auction off a chunk of rock believed to have originated on Mars for an anticipated two to four million dollars – a steal relative to the $28 million you would have dropped to experience a few fleeting minutes of zero gravity with Katy Perry.

Compare Mars and Earth in size, atmosphere, gravity, and potential for life. Discover their differences and shared traits. Explore the mysteries of the Red Planet!

With Trump’s new budget cutting NASA science programs, the Mars Sample Return mission could be replaced by a private-sector alternative.

This is the first time such an historical and rare piece is auctioned off. Sotheby’s says the eventual buyer of the items is guaranteed to own a piece of history.

Explore the race to Mars! Discover NASA, SpaceX, and China's plans, their groundbreaking goals, and the challenges of reaching the Red Planet.