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New research shows that the answer is yes. Not only do runaway planets exist, but some of them zoom through space at a few percent of the speed of light - up to 30 million miles per hour.
"These warp-speed planets would be some of the fastest objects in our Galaxy. If you lived on one of them, you'd be in for a wild ride from the center of the galaxy to the Universe at large," said astrophysicist Avi Loeb of the Harvard-Smithsonian Center for Astrophysics.
(Emphasis added by me)
Such speedy worlds, called hypervelocity planets, are produced in the same way as hypervelocity stars. A double-star system wanders too close to the supermassive black hole at the galactic center. Strong gravitational forces rip the stars from each other, sending one away at high speed while the other is captured into orbit around the black hole.
For this study, the researchers simulated what would happen if each star had a planet or two orbiting nearby. They found that the star ejected outward could carry its planets along for the ride. The second star, as it's captured by the black hole, could have its planets torn away and flung into the icy blackness of interstellar space at tremendous speeds.
Hypervelocity stars (HVSs) are stars with a velocity so great that they are able to escape the gravitational pull of the galaxy. Ordinary stars in the galaxy have velocities on the order of 100 km/s, while hypervelocity stars (especially those near the center of the galaxy, which is where most are thought to be produced), have velocities on the order of 1000 km/s.
The existence of HVSs was first predicted in 1988,  and their existence confirmed in 2005.  Currently, sixteen are known, one of which is believed to originate from the Large Magellanic Cloud rather than the Milky Way. All of the currently known HVSs are over 50,000 parsecs away and are unbound from the galaxy.
It is believed that about 1000 HVSs exist in our Galaxy. Considering that there are around 100 billion stars in the Milky Way, this is a minuscule fraction (~0.000001%)
Originally posted by mileysubet
Wow I learn something new everyday, thank you for posting this information. I wonder how long it would take one of these HVPs or HVS to decelerate, and what kind of power it would unleash if it collided with another celestial body?