RT @RonBaalke: Remembering Eleanor Helin on her birthday (1932-2009). Discoverer of over 800 asteroids & 20 comets, including 6524… twitter.com/i/web/status/8…
RT @RonBaalke: Remembering Eleanor Helin on her birthday (1932-2009). Discoverer of over 800 asteroids & 20 comets, including 6524… twitter.com/i/web/status/8…