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Billiard with asteroids, lets you move large asteroids through a sequence of small ones. ... Must be already baked by nature?
There are so many asteroids. To move a large asteroid, like cruithne to Mars, you don't have to do it directly. Small asteroids could push larger asteroids slightly to collide with even larger ones, until a larger one is cought by a gravity well.
Rather than investing $ to lifting more fuel, it could
be invested into getting more information -- surveying the surfaces, masses, spins, etc. of asteroids to make precision collisions.
Inspired by [asteroid to mars] idea.
zevkirsh's idea: "astroid to mars"
[Inyuki, Aug 02 2012]
||I think you'd want to do it by gravitational
slingshotting rather than by collisions - the result of
a collision would depend too delicately on things
like surface topography and spin.
||Okay, so it is what I thought. Bun in the corner gravity
||I feel the problem would be getting a piece of green baize big enough.
||...and let's not forget about the chalk. Where are you going to be a 1km/2 piece of chalk? If suddenly the white cliffs of Dover ain't there any longer, we'll know where to point the finger..