![]() ![]() They’re orphans, cast away from their mother stars during the chaotic birth of their native solar systems,” Neil DeGrasse Tyson says, as a planet emerges from the darkness. “The galaxy has billions of them, adrift in perpetual night. Instead, they travel in solitary arcs around the Milky Way’s core.Įarlier this week, Cosmos: A Spacetime Odyssey, introduced many of its viewers to the concept of these lonely planets. ![]() They have neither sunrises nor sunsets, because unlike the planets we’re more familiar with, these lonely worlds aren’t tethered to a star.
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