Jovian scars
Page 8 of the August 29, 2009, Science News shows a dark impact scar on Jupiter’s surface. Similar dark areas appeared when Comet Shoemaker-Levy 9 hit. Why are they dark? Clearly, we are not seeing any “subsurface dirt.” Also, the color cannot be due to some dark underlying gas. Could it be an enormous depression in the cloud cover, the bottom of which the light does not reach? Raul Pettai, Montville, N.J.
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