Tonight sees the return of Stargazing Live to BBC Television on BBC2/BBCHD. The series sees presenters Professor Brian Cox and Dara O'Briain bring their enthusiasm for astronomy to life, inviting viewers to appreciate the sky and the visible objects that surround us each evening.
Each show is followed by a half-hour discussion about the evening's theme and discoveries, with the two presenters joined by guests and a studio audience. This year, Back to Earth also features a special guest in the form of K9! The Doctor's second-best friend will be on hand to offer his own unique knowledge of the stars from his travels.
This week's shows look at Mars, charting history through the stars, and then meteors, asteroids and comets.
K9 isn't the first reference to Doctor Who in Stargazing Live; back in the first series guest Jonathan Ross was quite insistent he had spotted Gallifrey in the night sky! The clip is available to watch via the BBC's YouTube channel.