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Solar Sail Simulation
Very cool. As close to free propulsion as you can get. I always feel a twinge of sadness when I realize I probably will not see colonization in my lifetime. Then again, maybe that sadness is just the Phillip Glass score in the background. The one serious issue concerning solar sails are tears due to micro-meteorites and other space trash. I heard that they are thinking about self healing sails but that is all I've heard.
The Space Elevator
okay bob, time to toss a new ribbon up... a rogue plane/satellite/space-trash just flew into it again...