A blurry image of the last of Pluto's moons, Kerboros, has been released, and it's quite a surprise. Due to the gravitational effects it's had on the system, scientists had expected that moon to be rather large, with its dimness probably due to a very dark surface. However, the image shows it's very tiny (the smallest one of all) and just as bright as all the others. This was quite an unexpected discovery, and clearly some work needs to be done to figure out why there's such a discrepancy between the gravitational effects and the actual image.