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.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.