This artist's conception illustrates a gas giant planet alone in the dark of space, ejected from its own star system. Astronomers think our solar system might hold a distant ninth planet, hurled to the fringes during the solar system's early evolution.
This artist's conception illustrates a gas giant planet alone in the dark of space, ejected from its own star system. Astronomers think our solar system might hold a distant ninth planet, hurled to the fringes during the solar system's early evolution. TNS photo, file
This artist's conception illustrates a gas giant planet alone in the dark of space, ejected from its own star system. Astronomers think our solar system might hold a distant ninth planet, hurled to the fringes during the solar system's early evolution. TNS photo, file