A NASA probe that had a close encounter with a strange object from another solar system has been declared dead and scientists still do not know what happened.

The SETI Institute said Wednesday that extensive radio scans by its telescope in Northern California found no signs of otherworldly technology from our solar system’s latest interstellar visitor.

A new study suggests Mars could help scientists understand how alien worlds evolve by showing how a once warmer, wetter planet lost its atmosphere and crossed the edge of habitability.

A photo of a three-sided Martian "pyramid" has sparked discussions on potential advanced life on the Red Planet. Evidence of alien life or cosmic pyramid scheme? A documentary filmmaker sparked a discussion of advanced Martian civilizations after sharing ...

NASA engineers spun next-gen Mars helicopter blades past Mach 1 without shattering them. See how JPL unlocked the future of alien flight.

NASA's Curiosity rover has photographed extraordinary spiderweb-like formations on Mars that scientists believe could hold the key to ancient life on Mars