Twenty years ago astronomers discovered the first planet around a sun-like star, 51 Pegasi b. This is the story of the pioneers in planet-hunting and how those who have followed are closer to answering one of humanity's most ancient questions: Is there life elsewhere in the universe?
There are no TV Airings of The Search for Another Earth in the next 14 days.
Add The Search for Another Earth to your Watchlist to find out when it's coming back.
Check if it is available to stream online via "Where to Watch".