The discovery of a rogue planet with a disk around it indicates the presence of "mini planets" or moons ... system are gravitationally bound to the sun. But rogue planets move through interstellar ...

Pollard A quartet of Earth-like worlds, each about 20% to 30% the size of our planet, circle one of our ... with a mass around one-sixth that of the sun. At 5.97 light-years from Earth, it is ...