The spacecraft OSIRIS-REx has arrived at it’s target , asteroid Bennu. Bennu is a carbonaceous asteroid in the Apollo group with a possible Earth-crossing trajectory, making it highly suitable for physical study. Because asteroids are the last remnants of primitive material in the solar system, they are the last remaining clues of what the area around the solar system was made out of before the planets formed. OSIRIS-REx will take one 60 gram sample and return it to the surface of Earth for careful study in a lab.

The asteroid Bennu.

No instrument flown into space is as powerful as an advanced laboratory on the surface of Earth. OSIRIS-REx will spend a while studying the asteroid from its current distance before going into mapping and surveying orbits. After a landing site is determined, OSIRIS-REx will collect its sample, preparing for a return in 2023.

Source: https://www.nasa.gov/osiris-rex