So if you want a sneak preview of the book, to be published in the UK in July and in the US in the autumn/winter, head over to 365 Days of Astronomy and listen as I discuss Why Do the Planets Stay in Orbit? A new podcast from the book will be posted every month.

To listen to February’s podcast, 'How did the Earth form?' Click here.
To listen to January’s podcast, 'What is the Universe?' Click here.