Clark discusses the Oort cloud. It's the spherical cloud of a trillion lumps of rock and ice, most a few kilometers across, that forms the solar system's outermost boundary. The Oort cloud's distant edge could lie some 100,000 times further out from the sun than Earth, more than a third of the way to its nearest stellar neighbor, Proxima Centauri. Oort cloud objects are thought to be stuff left over from when the planets formed, and their distribution and sizes could help people understand that process.
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