A 54-pound meteorite from Mars is expected to fetch up to $4 million when it goes up for auction later this month at Sotheby's.

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.

An astrophysicist has torn Elon Musk’s dream of terraforming Mars to shreds, saying that it is “stupidest thing” anyone can choose to do. Those who’ve chosen a career in science follow one rule: you need to doubt yourself.

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

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

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

Mariner 4, built by JPL in Pasadena, took the images on July 14, 1965. One of the mission's leaders reflects on decades of studying the Red Planet.