Where To Stream The Sky at Night Season 2017 Episode 5

Scientists have spent hundreds of years observing the planets with telescopes and over fifty exploring the solar system through space travel, so you might have thought they knew our cosmic neighbourhood pretty well. But actually, they've hardly scratched the surface. The reality is that most of the solar system is still almost a complete mystery. Beyond the orbit of Neptune lies a vast number of strange, dark, icy worlds - the trans-Neptunian objects. And it's only over the last few years that...