The Arecibo telescope in Puerto Rico just bounced radar off a spinning, mile-wide rock, 5 million miles away, moving at 20,000mph...and we got pictures back. These observations amaze me every time. https://t.co/az7VEVKoYo pic.twitter.com/Rv5dZDM8E6

— Corey S. Powell (@coreyspowell) April 23, 2020