Dr Helen Sharman became a national hero when - at the age of 27 - she became the first Briton to go into space responding to a job ad she heard on the radio while driving home from work.
Aliens exist and they could be living invisibly among us on Earth, says the first British astronaut to blast into outer space.
Dr Helen Sharman was a 27-year-old food chemist when she visited Russia's Mir space station in May 1991.
She applied and was selected - beating out more than 13,000 others - after hearing a call for potential astronauts on the radio while driving home from work.
Almost 30 years on from her historic achievement, the Sheffield-born national hero said extraterrestrial life could be living right under our noses.