The first samples of soil from the asteroid shall be delivered to Earth in 2023. This was stated by NASA. The US space agency told about their mission to asteroid Bennu starting in September.
The probe carrier will be launched by a space launch vehicle. It will rich its target in 2018, gather rock samples and conduct various measurements and leave for Earth in 2021. Small asteroid Bennu was discovered three years ago.
NASA says Bennu is potentially the most dangerous for earthlings among all known asteroids, as it is periodically drawing near to our planet to relatively small distances. According to NASA calculations, there is a possibility of collision late in the 23rd century, though very tiny one.
Scientists hope to learn more about the composition of asteroids.