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!

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.

New discoveries by NASA's Curiosity Mars rover may not only explain why the Red Planet is a dry, lifeless desert, but that it may have been on an inevitable path to being a dead world despite being so similar to Earth.

A new map shows hidden Martian rivers stretching thousands of miles, offering fresh evidence of a warm, wet ancient Mars.