For millennia humans have wondered whether we are alone in the universe or there are aliens out there.
The religious would tell you Earth is special and God put life only on this planet – but the vastness of the universe makes it practically impossible to say there is no life out there.
Aliens almost certainly exist – the only problem is the Universe is too large and human technology too limited for us to get anywhere near them.
However, British astronaut Helen Sharman has not only said that alien life exists, she also argues some might be on earth right now without our knowledge.
“Aliens exist, there’s no two ways about it,” Sharman said in a chat with the Observer Magazine.
“There must be all sorts of different forms of life [among the billions of stars…it’s possible they’re here right now and we simply can’t see them”. she added.