This summer, NASAs New Horizons probe will make its closest approach to Pluto, and its anybodys guess what it will discover. With its bright and shifting colours, its part-frozen atmosphere and its huge variation in solar distance, it may well be one of the most changeable worlds in the Solar System. And its small size and vast distance means that we only have a vague idea of what it really looks like. This App includes images, videos, fiction and more.