A landmark has been reached for space scientists who want to put Einstein's Theory of Relativity to the test. They've been working for more than a decade on a space module which is about to enter its final stages of testing before being propelled 1.5 million kilometres into space.
Known as the LISA Pathfinder, its job is to measure minute waves of gravity. It's said this will open a new pair of eyes for humanity and help us undertsand more about black holes and collapsed stars.
Wesley Smith put on his protective clothing at the lab in Hertfordshire to try to explain more.