O n National Geographic Channel's ‘Nat Geo Explorer,' the episode ‘ A Traveller's Guide to The Planets – Saturn,' January 8 at 10 p.m., gives viewers an interesting insight. From Earth, Saturn's rings appear solid, but they are actually made up of chunks of rock and ice. They look spectacular, but navigating around them - and the planet's more than 60 moons - would be a nightmare. One travels through the rings, for a stunning CGI tour of this gaseous giant.

In ‘Naked Science' the episode, ‘Dirty Bomb Attack,' January 9 at 10 p.m. is a one-hour docudrama, where a U.S. city is the target of a hypothetical radiological assault. It begins with a dramatisation of a car bomb detonating in a busy street.