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Scientist Stephen Hawking once held a party for time travellers - but nobody turned up.

Professor Hawking said it was an experiment to prove time travel is not possible.

After hosting the party in 2009,, he said: “I have experimental evidence that time travel is not possible.

“I gave a party for time-travellers, but I didn’t send out the invitations until after the party.

“I sat there a long time, but no one came.”

The party was filmed and put on YouTube. There was a banner reading “Welcome time travellers” and sat beneath it a lonely looking Prof Hawking surrounded by champagne flutes, canapes and balloons.

He said: “Einstein’s general theory of relativity seems to offer the possibility that we could warp space-time so much that we could travel back in time.

“However, it is likely that warping would trigger a bolt of radiation that would destroy the spaceship and maybe the space-time itself."