Explanation:

NASA  spacecraft to an asteroid Bennu in 2016 and use a robotic arm to pluck samples that could better explain our solar system's formation and how life began.
? The mission, called Origins-Spectral Interpretation-Resource Identification-Security-Regolith Explorer, or OSIRIS-REx, was the first U.S. mission to carry samples from an asteroid back to Earth.
? After traveling three years, OSIRIS-REx approach the Bennu , near Earth asteroid designated 1999 RQ36 in 2018.
? Once within three miles of the asteroid, the spacecraft will begin six months of comprehensive surface mapping.
? The science team then will pick a location from where the spacecraft's arm will take a sample. The spacecraft gradually will move closer to the site, and the arm will extend to collect more than two ounces of material for return to Earth in 2023.
? RQ36 is approximately 1,900 feet in diameter or roughly the size of six football fields.
? The asteroid, little altered over time, is likely to represent a snapshot of our solar system's infancy. The asteroid also is likely rich in carbon, a key element in the organic molecules necessary for life