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.

"The problem