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The splash of the impact of Fragment G of Comet Shoemaker-Levy 9 on Jupiter.
The ring of hot gas is 33000km wide, and it was expanding at 4 km/s.

The color coding is 3.09 um (B), 3.42 um (G) and 3.99 um (R)

Images from Peter McGregor and Mark Allen, ANU 2.3m telescope and Siding Spring