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Why is there Water?

Planetary science can tell us what the Earth is made of and how it came to be.

A journey from the big bang to Earth as it is today. Results from astronomy, planetary science, and geophysics are pulled together to examine how the Solar System (and the Earth) evolved, what the Earth is made of, where the material came from, and how it got to Earth (and when).  Ambitious?  You bet!

Evolution of the Earth

Time line showing major developments in the evolution of the Earth

A Time Line for the Evolution of the Earth