Astronaut Helen Sherman: extraterrestrials exist and they may be here now

Helen Sharman was the first British astronaut and in 1991 became the first woman to visit the Soviet Mir space station. In an interview published in The Guardian yesterday, she made a comment about extraterrestrials, the latter part of which is an eyebrow raiser:

"Aliens exist, there's no two ways about it. There are so many billions of stars out there in the universe that there must be all sorts of different forms of life. Will they be like you and me, made up of carbon and nitrogen? Maybe not. It's possible they're here right now and we simply can't see them."