Today on Radio 4 you can hear me talking about the discoveries of exo-planets, systems of planets orbiting other stars. Astronomers have just passed the 1000 mark on the scoreboard, but we have yet to identify a twin to Earth. I am being interviewed on Inside Science at 16.30 and 21.00 hrs.

If you miss it live, you can hear the programme here. The interview starts about a quarter of an hour into the broadcast.