Hubble found evidence of water jets on Jupiter's moon Europa.
Hubble finds and asteroid spouting comet-Like tails.
Hubble found a new moon of Neptune in July 2013.
Hubble detects a fifth satellite for Pluto.
Hubble finds evidence for fourth Pluto satellite.
Hubble launched on April 24, 1990 with the shuttle mission STS-31.
HST events Wikipedia
HST events, things of interest related to the Hubble Space Telescope, chronologically.