Stephen Hawking's family have invited time travelers to his memorial service, seeking to tackle one of the curiosities that eluded the British physicist during his extraordinary life.
The world's most recognizable scientist died at the age of 76 after a lifetime spent probing the origins of the universe, the mysteries of black holes and the nature of time itself.
The memorial service will take place on 15 June - his children are offering 1,000 free tickets to the public for the Westminster Abbey event.
The ashes of the physicist, who died on 14 March, will be interred between the graves of Sir Isaac Newton and Charles Darwin.
Those wishing to apply have to fill in a form and state their date of birth, which can be any day up to the end of 2038.
The option to have a date of birth in the future was spotted by London blogger ianvisits who wrote on his site: "Professor Hawking once threw a party for time travelers, to see if any would turn up if he posted the invite after the party.
"None did, but it seems perfect that the memorial website allows people born in the future to attend the service. Look out for time travelers at the Abbey."
Sarah Bridle, a professor of Astrophysics at the University of Manchester, told BBC Radio that Hawking, who was confined to a wheelchair for most of his life, had remained curious about the potential for time travel, even after his party in 2009.
"He was curious and he had a great sense of humor," she said. "He said he combined his two favorite things, experiments and champagne to put on this party."
