Some researchers have sought to explain the steady orbital speed with alternative theories of gravity, but it is unlikely that anything other than dark matter can explain the new observations. (discovermagazine.com)
At its current orbital speed, the planet will get ripped apart by the star's gravity in just 1.4 million years, the team say. (newscientist.com)
More massive galaxies have more gravity so their stars are accelerated to faster orbital speeds. (astronomynotes.com)