Black holes explained in 90 seconds

Prof Stephen Hawking is delivering the BBC's 2016 Reith Lectures on the topic of black holes.

Based on his second talk, and with animation by Aardman Studios, this is a 90-second explanation of why black holes may not be as black as they appear.

The Reith Lectures, Tuesday 2 February, 0900GMT, BBC Radio 4. Repeated at 2130GMT and available on BBC iPlayer Radio.