Japan has successfully landed two rovers on the surface of an asteroid. Japanese space agency JAXA said Saturday the rovers, known as Minerva-II1, separated from the Hayabusa-2 spacecraft and landed on Ryugu, a kilometer-wide rock about 185-million miles from Earth.
They're the first mobile rovers to land on an asteroid. The mission will study the composition of the rock and gather samples to return to Earth in 2020. Scientists hope the asteroid will reveal details about the formation of the solar system.