MARS

The researchers used meteorite samples from NASA to confirm their theory.

How to get free samples in honor of National Chocolate Day.

The comet could provide clues to the solar system's earliest days more than 4 billion years ago, according to NASA.

Comet Siding Spring will pass just 87,000 miles from Mars Sunday.

NASA's fleet of orbiters and rovers will be monitoring the close approach of Siding Spring.

The study, conducted by a team of MIT researchers, cast doubts over the feasibility of a planned mission to colonize Mars by 2025.

Siding Spring’s rare encounter with Mars is expected to help scientists unlock mysteries about the formation of the solar system.

The New York Times published the India Mars Mission photo on Sept. 28.

India's run of success with its mission to Mars continued Thursday, as its spacecraft sent back the first images it took over the planet.

India's Mars orbiter mission was developed at a fraction of the cost spent on NASA's MAVEN probe.

NASA's MAVEN probe will assess whether water on Mars evaporated or froze 3.5 billion years ago.

Both spacecraft will explore the Martian atmosphere and the planet's surface, to study local minerals and look for possible signs of life.

The rover has reached the foot of a 3-mile-high Martian mountain, two years after beginning its search for life on the red planet.

'Destiny' launches Tuesday, and developer Bungie launched a PlayStation-exclusive map that won't be available for the Xbox until next fall.

Mars rovers Curiosity and Opportunity hold promise that humans will one day travel to and explore the red planet.

Although Siding Spring is not likely to hit Mars, the planet is expected to pass through the comet's trail of gas and dust.

The new rover will carry more sophisticated hardware to determine if the red planet will ever be habitable for humans.

Scientists said they would have to position all spacecraft on the opposite side of Mars before the comet comes closer.

Frozen carbon dioxide, or dry ice, does not naturally exist on Earth, but it is abundant on Mars.

The Z-2 prototype is being upgraded by NASA with a launch date in mind.

This is the first time that a planet’s transition of the sun has been seen from any planet other than Earth.