Rosetta Finds Earth's Water May Not Have Come From Comets
The Rosetta comet mission has released its first findings, showing comets like 67P probably weren't the origin of Earth's water.By Steven Sparkman | December 10, 2014
The first findings from the world-famous Rosetta mission are in, and comet 67P has thrown cold water on the leading theory for the origins of Earth's oceans.
The new study looked at water on 67P's surface and concluded comets might not have brought water to Earth after all, despite several previous findings pointing in that direction.
Scientists aren't exactly sure why Earth, unlike other rocky planets like Mars and Venus, has vast oceans of liquid water. One explanation is that as much as half of the water currently swirling around our planet came from elsewhere. (Video via NASA)