Uncharted Worlds

The search for worlds beyond our solar system has reached a fever pitch. Astronomers have been using new generation telescopes on the ground and in space to see into the blinding light of other stars to detect planets. They have found that the galaxy is filled with planets, including billions about the size and composition of Earth. But how many are truly like Earth? If any are within the neighborhood of our sun, how will we cross the voids of space to pay them a visit?