Runaway black hole births stars as it speeds through galaxy.

A "runaway" supermassive black hole has been observed travelling at four million miles per hour away from its galaxy, producing new baby stars in its wake. The reason for this unusual activity is unclear, but it is suggested that when the black hole comes into contact with gas, it sparks new stars into life as the gas cools down. The findings were reported in the Astrophysical Journal Letters by a team led by Yale astronomy professor Pieter van Dokkum and observed in NASA's Hubble Space Telescope.