Elon Musk set to build rockets to Mars

Elon Musk says he aims to send people to Mars in 2024.

The rocket and car entrepreneur told an audience in Adelaide, Australia, that he would begin building the necessary ships to support the mission next year.

They would be called the BFR... but what does the F stand for? Professor Alan Duffy from Swinburne University of Technology in Melbourne explains to the Today programme.