Nasa spacecraft leaves asteroid Bennu with a belly full of space rock samples

Osiris-Rex has been flying around the ancient asteroid since 2018 and collected nearly a pound of rubble last fall

With rubble from an asteroid tucked inside, a Nasa spacecraft fired its engines and began the long journey back to Earth on Monday, leaving the ancient space rock in its rearview mirror.

The trip home for the robotic prospector, Osiris-Rex, will take two years.