Have you been watching Wonders of the Solar System, a (fabulous) series about the solar system? Part three - "The Thin Blue Line" - is on BBC 2 tonight 9:00pm - 10:00pm (If you missed the first two parts, you can watch the episodes via BBC iPlayer ).
The five-part series is presented by the very enthusiastic physicist, Professor Brian Cox. The programme is excellent mostly because Professor Cox explains scientific facts (the laws of physics) so that they are easily understood but not in a condescending way. It's an outstanding series, educational but also very entertaining.
Wonders of the Solar System - BBC Two
You can also follow Professor Cox on twitter