Science and Technology For Decades We Monitored Bennu as One of the Asteroids at Highest Risk of Collision with Earth, but When NASA Brought Back Samples from the Asteroid, Laboratories Found Clay Formed on the Ocean Floor, Suggesting That Bennu May Be a Remnant of a Planet with an Ocean Destroyed 4.5 Billion Years Ago and That Part of Earth’s Water Came from This Long-Gone World Valdemar Medeiros 12/03/2026 at 15:31
