Solar Spacecraft Propulsion

If the idea I just submitted http://www.halfbakery.com/idea/our_20sun

were to be constructed it strikes me that it could possibly be used to facilitate space exploration as well.

Assuming you constructed the "Star Strobe" (someone elses name but I like it) and it was built like a circular but flat disc as opposed to a half sphere, you could use positioning motors to flex it concavely thus focusing a great deal of heat and light to a point. You could use the beam to drive a spacecraft in the desired direction (since the Star Strobe is movable).

So once you establish contact with the aliens you could go visit them.

If we were to colonize another solar system we could construct another star strobe there and use -its- beam to slow an incomming craft thus enabling two way transit.