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DanielLC comments on Stupid Questions December 2014 - Less Wrong
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I'm curious about the thought process that led to this being asked in the "stupid questions" thread rather than the "very advanced theoretical speculation of future technology" thread. =P
As a more serious answer: Anything that would effectively give us a means to alter mass and/or the effects of gravity in some way (if there turns out to be a difference) would help a lot.
I wasn't sure there was a way to do it within current physics.
Now we get to the hard question: supposing we (broadly interpreted, it will probably be a successor species) want to move the earth outwards using those little gravitational nudges, how do we get civilizations with a sufficiently long attention span?
If we haven't gotten one by then, we're doomed. Or at least, we don't get a very good planet. We could still have space-stations or live on planets where we have to bring our own atmosphere.