RT @universetoday: Charles Dillon Perrine discovered Elara, one of Jupiter’s moons, on January 2, 1905. – http://t.co/8rEQjcaG
RT @universetoday: Charles Dillon Perrine discovered Elara, one of Jupiter’s moons, on January 2, 1905. – http://t.co/8rEQjcaG