Seems at least plausible. Comet Rosetta's perihelion was August 13, 2015 [1] and there was a big outgassing event February 2016 [2]. Takes time for heat to pro

Seems at least plausible. Comet Rosetta's perihelion was August 13, 2015 [1] and there was a big outgassing event February 2016 [2]. Takes time for heat to propagate through stuff. But yeah, I'd rather it was due to radiation pressure on an alien solar sail. [1] https://www.space.com/30237-rosetta-spacecraft-comet-closest-to-sun.html https://www.space.com/30237-rosetta-spacecraft-comet-closest... [2] http://blogs.esa.int/rosetta/2016/08/25/rosetta-captures-comet-outburst/ http://blogs.esa.int/rosetta/2016/08/25/rosetta-captures-com...