NASA is tracking a truck-sized asteroid which is set to hurtle by Earth today at many times the velocity of a speeding bullet ...
Scientists are keeping close watch on the space rock, which was spotted last month and is currently heading away from Earth.
NASA scientists found amino acids, key minerals, and nucleobases for DNA in samples from the OSIRIS-REx asteroid mission.
BS4 may be anywhere between 17 and 40 feet across, and will approach at about twice the distance between the Earth and moon.