British singer Sarah Brightman is in talks with the space tourism firm Space Adventures to become the world's eighth space tourist, a senior Russian space official said on Wednesday.

"I think that if we do come to a consensus, then theoretically it can happen," Alexei Krasnov, head of manned space missions at the Russian space agency Roscosmos, said.

Krasnov could not give a timeframe or details.

No contracts have been signed yet, he added.

If the deal goes through, Brightman, the world's bestselling classical vocalist, can become the eighth private individual - and the second woman - to make the trip to the International Space Station.

Brightman has not commented.

The previous tourists have paid the average of $30 million for their tickets.