In this video segment adapted from NOVA, learn about a possible explanation for the origin of much of Earth's liquid water. Step into the lab of Sarah Stewart, an astronomer who studies how impacts in the early solar system may have set the stage for the habitable planet that Earth is today. Observe how she smashes materials together at high speed to better understand what could have happened when a planet-sized object hit the young Earth. Watch video that features real satellite imagery as well as simulations to explore the importance of a giant impact in the evolution of the planet.
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