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Did All of Earth's Water Originally Come From Outer Space?

A comet carrying enough water to fill a small lake broke apart near the sun in 2000. It was a great surprise, providing astronomers with the first tangible evidence to support a controversial theory that Earth’s water may have arrived on comets billions of years ago. The water on this comet is thought to have the same isotopic composition as water found on Earth. The estimation for how much water it carried was made by scientists at the Solar and Heliospheric Observatory, a project run cooperatively by NASA and the European Space Agency (ESA). They saw the cloud of hydrogen released as the comet broke up. “The idea that comets seeded life on Earth with water and essential molecular building blocks is hotly debated, and for the first time, we have seen a comet with the right composition to do the job,” said Michael Mumma of NASA’s Goddard Space Flight Center, according to the NASA website. Water has been spotted in other parts of space, but unlike the water in this comet, it doesn’t have the same isotopic composition as Earth’s. More via The Epoch Times.

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