Hyperspeed Planets Are Hurtling Out of the Milky Way?
Runaway worlds may move at up to 30 million miles an hour, study predicts.
Only subatomic particles such as cosmic rays are known to reach higher speeds in the Milky Way. (Related: "Lightning Creates Particle Accelerators Above Earth.")
So what would it be like on a lonely, fast-moving world? For one thing, the night sky would be a lot more dynamic, said study co-author Idan Ginsburg, an astronomy graduate student at Dartmouth College.
"If you were on the planet, from your perspective, you'd be moving so fast that in a relatively short time you'd see the galaxy just getting farther and farther away."
Ultimately, Ginsburg said, the planet would probably get kicked out of the galaxy.
"To where? That's a good question, but it would be a one-way ticket and a wild ride," he said.