What do we know? Recent planetary exploration brings a flurry of results:
The last few months have been remarkable for planetary exploration. We have found a planet about twice the size of earth in the habitable zone of a star about the same size as our sun, and we have had space vehicles gather information of Ceres and Pluto, neither of which were significantly better than blobs in our best telescopes. Finally, there was a landing on a comet. From these, we have gathered a lot of data, but it is interesting to reflect on what extra we know.