NASA's Viking missions to Mars may have discovered evidence for life on the Red Planet after all, according to scientists who are seeking to correct what they believe to be a 50-year-old mistake that has led everybody to think that Mars is lifeless.

Scientists say the dream of settling the Red Planet comes with major health risks that we are only beginning to understand.

Remember when “Right Round” was inescapable? Or when “Forget You” became the clean version you belted out in every car ride, every party, every dorm room pregame? What about “Wavin’ Flag”

In a new study, researchers say that nonbiological sources they considered could not fully account for the abundance of organic compounds in a sample collected on Mars by NASA's Curiosity rover. The paper is published in the journal Astrobiology.

Earth and Mars are constantly moving, but don’t stay a constant distance apart. Plus, spacecraft don’t travel in a straight line to their destination.

NASA has plans to send astronauts to Mars surprisingly soon, but their exact timeline is still rather vague for a number of different reasons.

The current image of Mars as an arid and hostile desert contrasts sharply with the history revealed by its surface. Channels, minerals altered by water, and other geological traces indicate that the red planet was,