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May 24th, 2018 
Awake Goy The jets, which reach several kilometers into space, have been identified in space missions going all the way back to 1986. Since their discovery, though, scientists have tried to understand the processes on the surface that cause the mysterious projections – and what they reveal about the comet itself.
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In 2014 the European Space Agency’s Rosetta mission landed on the comet, which is officially called 67P/Churyumov-Gerasimenko, and spent nearly two years there studying how, every morning, the comet routinely transforms from an almost lifeless rock to a dust-spewing phenomenon.
The mission took more than 70,000 photos throughout the process and discovered that the early morning activity is caused by frost, which forms at night on the comet’s cold surface. When morning comes and the sun’s rays touch the icy coating, it begins to evaporate.
“When the sun rises over a part of the comet, the surface along the terminator almost instantaneously becomes active,” researcher Dr Xian Shi explains. “The jets of gas and dust, which we then observe within the coma, are very reliable: they are found each morning in the same places and in a similar form.”
The new research revealed that the peculiar shape and jagged topography of the comet are responsible for the phenomenon. The researchers analyzed images from the “neck” region of the comet, which connects its two lobes. They used computer simulations to gain a better understanding of the driving processes.
The frost evaporates quickly form strongly-illuminated regions and much slower from areas at lower altitudes or in the shade. In addition – similar to how an optical lens works – pits and other concave structures on the comet virtually concentrate gas and dust emissions. These two effects proved decisive in creating the jets.
On a comet with a more standard shape the structures would not be as prominent, meaning gas and dust would be much more evenly distributed. “The complex shape of Rosetta’s comet makes many investigations difficult. But for this study it was a blessing”, Shi said.
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Source Article from https://www.rt.com/news/427640-rosetta-comet-sunrise-jets/?utm_source=rss&utm_medium=rss&utm_campaign=RSS
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