A large asteroid just 'snuck up on us.' Why wasn't it detected sooner?
by from The World: Latest Stories on (#4KYJG)
Kris Stanek monitors the sky for the group All-Sky Automated Survey for Supernovae, or ASAS-SN, at The Ohio State University. The group observed the giant space rock, known as Asteroid 2019 OK, just before it passed by Earth.