Professor Hawking won his bet with director of the Perimeter Institute in Canada Neil Turok after wagering that gravitational waves from the first fleeting moments after the big bang would be detected.
Turok is said to be needing more evidence before conceding the bet. He said the bet rested on results from the European Space Agency’s Planck space telescope, which last year failed to spot any signs of gravitational waves.
Hawking is well known for making bets with other scientists. He recently lost $100 to Gordon Kane at the University of Michigan after betting that scientists at Cern, home of the Large Hadron Collider near Geneva, would not find the Higgs boson. They discovered the particle in July 2012.