As the Rosetta Mission’s comet approached its most active period last year, the spacecraft spotted carbon dioxide ice – never before seen on a comet – followed by the emergence of two unusually large patches of water ice. See http://www.esa.int/Our_Activities/Space_Science/Rosetta/Icy_surprises_at_Rosetta_s_comet
Icy surprises at Rosetta’s comet
As Rosetta’s comet approached its most active period last year, the spacecraft spotted carbon dioxide ice – never before seen on a comet – followed by the emergence of two unusually large patches of water ice.