An unusual sighting in a NASA image has reignited speculation that something extraterrestrial once existed on Mars.

New research suggests that alien radio signals may be transformed by plasma from their home stars — and scientists on Earth ...

Scientists propose building a lab on the moon to screen Mars and other space samples for alien microbes before they ever ...

American Religious Belief in Extraterrestrial Life (Princeton Univ., Sept.) argues that several American religious traditions have long believed in that aliens exist—and want to help us.