With so many undiscovered planets in the galaxy, it surely seems there are other planets like Earth that harbour life.
Dr Michael Albow has recieved funding to study the light emmitted from stars to find these planets, and while he has located quite a few, he has not yet laid eyes on them.
"What we're really trying to do is establish how many planets there are in the galaxy," he said.
"Are solar systems like ours common, or are they unusual? All the indications we have so far, it seems that small planets like the Earth are actually probably rather common, they're just extremely diffucult to detect."
He said the planets he had detected were up to 20,000 light years away.