The discovery of more than 330 planets outside our solar system in recent years has helped refine the number of life forms that are likely to exist.
The current research estimates that there are at least 361 intelligent civilisations in our Galaxy and possibly as many as 38,000.
The work is reported in the International Journal of Astrobiology.
Chris Wren writes:
Sure, it's based on a simulation - a very complex simulation, but it beats saying "I didn't see any alien Von Neumann probes when I looked out my window this morning. We're obviously alone in the universe." Which is basically all the Fermi "Paradox" amounts to, no matter how people try to dress it up.