I share Annalee's enthusiasm:

This is huge. We've discovered a lot of exoplanets, including rocky Earth-like ones, in far-away star systems. But the European Space Agency announced this afternoon that our solar system's nearest neighbor, a brilliant trinary star system called Alpha Centauri, has a planet that's roughly the mass of Earth. That's right — just 4.3 light years away, there's a planet that might be a lot like our own.

Now if we can just travel faster than the speed of light we can get there in under an election cycle.

How will humans get to Alpha Centauri?