Contact: Christine Pulliam
Harvard-Smithsonian Center for Astrophysics
Caption: Astronomers have theorized that long-ago asteroid impacts delivered much of the water now filling Earth's oceans, as shown in this artist's conception. If true, the stirring provided by migrating planets may have been essential to bringing those asteroids.
Credit: David A. Aguilar (CfA)
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Related news release: Asteroid diversity points to a 'snow globe' solar system