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Solving the mystery of how comets are born

29 July 2016 Astronomy Now

Detailed analysis of data collected from Comet 67P/Churyumov-Gerasimenko by ESA’s Rosetta spacecraft show that comets are the ancient leftovers of early solar system formation, and not younger fragments resulting from subsequent collisions between other, larger bodies.

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How Rosetta’s comet got its shape

29 September 2015 Astronomy Now

The origin of of Comet 67P/Churyumov-Gerasimenko’s double-lobed form has been a key question since Rosetta first revealed its surprising shape in July 2014. By studying the layers of material seen all over the nucleus, scientists have shown that the shape arose from a low-speed collision between two fully fledged, separately formed comets.