Wow! Hubble Telescope Sees Rare 3-Moon Shadow Dance on Jupiter
Thursday, February 5, 2015 - 15:30
in Astronomy & Space
The rare triple-moon conjunction, which Hubble witnessed on Jan. 24, involved Io, Callisto and Europa — three of Jupiter's four Galilean moons (so named because they were discovered by astronomer Galileo Galilei in the early 17th century).