"'There are two figures you need to know. One is what our estimate of how many civilisations there are in the universe that are sending out signals into space [about 10,000] and the second is how long will it take to search through enough stars in the universe to statistically have a chance of picking up those signals.' Put these numbers together, she claims, and we will encounter aliens by 2025."

I'll put it in my diary.

EducationGuardian.co.uk | Research | Aliens are out there, say scientists