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http://www.bbc.com/news/science-environment-35639899 Basically alot of cold invisible stuff in space, we tend to see stuff that scatters, absorbs (less-so) or emits light, but this stuff is cold, very cold, and at most wavelenths it will not be visible. In our journey to find faster spacecraft that thinks that are very small like aggregates less than 400 nm in size are small but can create tremedous energies. At 0.33c (1E8) such 200 nm particles 400 joules of energy.
