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Runaway planets ejected from galaxy at insane speeds

Runaway planetscPlanets in tight orbits around stars that get ejected from our galaxy may actually themselves be tossed out of the Milky Way at blisteringly fast speeds of up to 30 million miles per hour, or a fraction of the speed of light, a new study finds.

"These warp-speed planets would be some of the fastest objects in the galaxy, aside from photons and particles like cosmic rays," said Avi Loeb, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. "In terms of large, solid objects, they would be the fastest. It would take them 10 seconds or so to cross the diameter of the Earth."

In 2005, astronomers found evidence of a runaway star that was flying out of the Milky Way galaxy at a speed of 1.5 million mph (2.4 million kph). This hypervelocity star was part of a double-star system that wandered too close to the supermassive black hole at the center of the galaxy.

The strong gravitational pull at the galactic center ripped the stars apart, sending one hurtling through space at high speeds, while capturing the other to stay in orbit around the massive black hole.

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