Meteorites regularly hit Earth, although most go undetected. Occasionally a big meteorite collides with Earth and when it does, it can cause devastation. Lucie Green and Chris Lintott visit the Natural History Museum to look at its meteorite collecti... (more)on and discuss the recent Russian impact. Jon Culshaw goes on a meteorite hunt, while Pete Lawrence and Paul Abel give their beginners' guide on how to look at Saturn.