Professor of Space Geodesy at University College London. I guess I'm the science nerd with glasses in those films with a bunch of much cooler and good looking kids - I might have some momentary flicker of credibility with a line like "That's not a frisbie, Walter, it's an asteroid" or when something needs fixing, but I never get the girl.

On the other hand, if you saw the first edition of the new Dr Who series when the Doctor (Christopher Ecclestone) said to Rose Tyler 'I can feel the planet turning in space beneath us', well, that's me too.

I love photography, I think it is an inspiring and delightful art form