Conversation

Astro Picture of the Day
Where do comet tails come from? no obvious places on the nuclei of comets from which the jets that create comet tails emanate..Rosetta not only imaged a jet emerging from Comet 67P/Churyumov-Gerasimenko, but flew thru it..picture showing bright plume emerging from small circular dip bounded on one side by a 10-meter high wall. Analyses of Rosetta data shows that the jet was composed of both dust and water-ice..
#apod
https://apod.nasa.gov/apod/
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