Before and after: Unique changes spotted on comet 67p/Churyumov-Gerasimenko
(PHYSorg.com Space & Earth)

A study published March 21, 2017 in the journal Science summarizes the types of surface changes observed during the two years that the European Space Agency`s Rosetta spacecraft spent investigating comet 67P/Churyumov-Gerasimenko. Notable differences are seen before and after the comet`s most active period-perihelion-when it reached its closest point to the Sun along its orbit.