Why smaller planets are better at building large moons

-size planetesimal called Theia slammed into Earth, gouging out a huge wound in our planet and rendering its entire surface molten. It's believed that the moon then coalesced from debris that settled into a ring around our planet.

Before you ask, no, streaming instability has nothing to do with when a show on your favorite streaming channel starts to buffer. Rather, a streaming instability describes how small particles in a vapor-rich disk around a planet are able to accrete into concentrations that rapidly form moonlets ranging in size from 10 yards to 62 miles .

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