Answer:
The planet OGLE-05-390L b orbits a star about 6000 parsecs... about 20000 light years from earth. They're finding planets around other stars almost weekly... So that may change. The farthest (galaxy) we know of is a quasar whose light has been traveling for 12 billion years. That object is now about 27 billion light years from us. Since the universe is about 15 billion years old... That's as far as we can see back in time. The light from anything much further away wouldn't have had time to get to us.