When's the First Flight?

Did you hear the good news? Scientists have announced the discovery of the first "earth like" planet outside of our solar system. Astronomers have discovered dozens of planets outside our system, but up till now they have all been giant, gaseous, Jupiter-like planets. But now, for the first time, astronomers believe they have sufficient data and evidence to show that a recently discovered planet in a system 20,000 light years from earth is in fact a smaller, rocky planet and just as significantly, this planet appears to orbit its star in an orbit that is in the "habitable" zone. In other words, in an orbit that is neither too close to the star, nor too far from it (in either case, temperature extremes would make the evolution of life extremely improbable).

Now we just have to figure out how to get there.