Queen guitarist Brian May has opened up about his fears for the future of humanity.

During a recent interview, the rocker/astrophysics Ph.D. warns that it's only a matter of time before the earth is struck by asteroid.

"NASA has done a very good job of finding the very largest objects, the ones that would destroy the human race, it's the ones that would destroy a city or hit the economy for a couple of hundred years that are the problem," he explained.

He added, "The more we learn about asteroid impacts, the clearer it becomes that the human race has been living on borrowed time."

"The campaign launched this week is intended to raise awareness and put pressure on governments to act."