On 19 July 2009 an impact was observed , which caused a black spot on Jupiter 's atmosphere . This unpredicted event was first reported by Anthony Wesley , who also first observed the 2010 event . The 2009 impact has been studied by NASA 's Hubble Space Telescope , and the study suggests that the observed incident was a hit by an asteroid about 500 metres wide
an impact
2009 Jupiter impact event
2010 Jupiter impact event