Element Ratios Suggest Earth Collided With a Mercury-Like Planet

Planet Earth viewed from orbit.

Research by Rice University scientists suggests that virtually all of Earth's life-giving carbon could have come from another planet. (Image: Siarhei Yurchanka via Dreamstime)

Study Says Life Began on Earth at Least 4.1 Billion Years Ago

Earth as seen from outer space.

Sylvia believes that at some point in 2100, 'the lights go out' for humans, if not the planet. (Image: Siarhei Yurchanka via Dreamstime)