Skylights, openings in the surface of Mars that descend down into caves, have been found on Mars, along with signatures for ...

Bigfoot has long lived in the realm of campfire stories and grainy photos, but the modern search for the creature is ...

When a volcano that has slept for centuries suddenly roars back to life, the first clear view no longer comes from a ship or a nearby village, but from orbit. Earlier this year, a NASA satellite ...