Inside the synestia, illustration
Inside the synestia, illustration. The synestia is a hypothetical doughnut-shaped cloud of molten and gaseous rock created when a Mars-sized body collided with the Earth. It is theorized that the Moon formed in the midst of this material. Here we are within the synestia, surrounded by a mass of molten rock and metal., Photo by RON MILLER / SCIENCE PHOTO LIBRARY
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