This is interesting, thank you for the post. From the abstract: > Oumuamua began as an icy planetesimal that was irradiated at low temperatures by cosmic rays

This is interesting, thank you for the post. From the abstract: > Oumuamua began as an icy planetesimal that was irradiated at low temperatures by cosmic rays during its interstellar journey I think this is interesting for one more reason: Oumuamua is considered to be of extra-solar origin because it moves faster than solar system's escape velocity. When I started reading the abstract I thought "wow, could it be that radiolysis accounts for the extra speed and the thing is actually of solar origin?", but no, it still comes from outer space :)