Moving planets?

Let's see.

What we'll need...

Superconducting solar-powered magnets... (maybe dismantle Mercury, Venus and Mars for the materials)

A whole bunch of small black holes.

A few centuries to "nudge" the sun out of its galactic orbit, by using gigantic magnetifc fields and gravitic effects from the black holes to funnel solar energy out to one side, like a giant rocket.

Voila! We have a mobile solar system!

We'll need to juggle the movement finely, so that the orbits of the (remaining) planets don't go out of whack and that the solar rocket doesn't accidentally hit jupiter and send it careening through the solar system like a gigantic planet-gobbling comet.

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The problem with a Fusion powered spacecraft is the amount of fuel it has to carry is still prohibitive. It's better to do it ram-style, with a huge magnetic scoop picking up stray hydrogen between stars... but it would take a very huge scoop (tens or hundreds of kilometers) to power a colony sized spacecraft.

I'm still waiting for a quantum-fluctuation drive. One that makes power from quantum particles that are spontaneously generated out of vacuum. Every nanosecond, there are tons of quantum particles generated in empty space... but they last for a tiny fraction of a second, as their anti-particles are generated at the same time, and they cancel each other out. If we can figure out how to separate particle and anti-particle before they cancel, we have potentially limitless power at our fingertips. No more hunger, no more want, and we'll have spaceships that can reach the stars.

Of course... so far, it looks like an impossible task...