RT @RonBaalke: On this day in 1993, Galileo flew by asteroid 243 Ida and would discover it had a moon: Dactyl. https://t.co/GMDTQe2cvs
RT @RonBaalke: On this day in 1993, Galileo flew by asteroid 243 Ida and would discover it had a moon: Dactyl. https://t.co/GMDTQe2cvs