Faster-than-light space travel has been a staple of science fiction since before the Starship Enterprise first went warp-speed. But could it ever really happen? Are we discovering potential ways to get round Einstein’s iron rule about spacetime’s speed limit? And could the secret to travelling at the speed of light be hidden within the underground tunnels at CERN? Theoretical physicist Dr Sabine Hossenfelder explains the latest thinking on ‘FTL’ to Anna Machin. Please fasten your seatbelts. Every Monday and Thursday WHY? takes you on an adventure to the edge of knowledge, asking the questions that puzzle and perplex us, from the inner workings of the universe to the far reaches of our dreams. Follow on your favourite app so you never miss an episode. WHY? is written and presented by Anna Machin. Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit megaphone.fm/adchoices