Nasa will be sending two new missions to Venus for the first time in more than 30 years

Professor Andrew Coates (UCL Space & Climate Physics) says that the planet is “Earth’s evil twin” with surface temperatures hot enough to melt lead and sulphuric acid clouds.

Listen: BBC Radio 4 ‘Today’ (from 2 hours 55 mins 53 secs), More: BBC 2 Radio ‘Ken Bruce’ (from 1 hour 32 mins).