The universe is vast with millions of planets where intelligent life might evolve. So why aren't aliens visiting us all the time, or sending us signals?
This is known as the Fermi paradox after the Italian physicist Enrico Fermi who discussed the question in 1950.
Scores of theories have been put forward to explain the paradox.
Perhaps we are alone in the Universe? Perhaps aliens are here already but don't let on? Perhaps aliens are not interested in us.
David Skibinski, Professor of Evolutionary Biology at Swansea University, will review these theories and invite opinion on which seem most plausible. This talk has been organised by the Wales Gene Park.
Free entry. Please contact the Dylan Thomas Centre on 01792 463980 for more information.
For more information on other events taking place at the Dylan Thomas Centre visit http://www.dylanthomas.com.
The Dylan Thomas Centre is open seven days a week and celebrates Dylan Thomas, Swansea's world famous poet.
It features a permanent exhibition on Dylan Thomas and his life and is also home to many literary events throughout the year, including the annual Dylan Thomas Festival during October and November.