A NASA spacecraft with samples from an asteroid is making its long return back to Earth.
The trip home from OSIRIS-REx will take about two years.
The spacecraft reached an asteroid in 2018 and spent two years flying near and around it before collecting rubble from the surface late last year.
The asteroid it collected from is estimated to be 4.5 billion years old.
It will be the biggest sample size for the U.S. since the Apollo moon rocks.
