Organizers of Stephen Hawking's memorial service have seemingly left the door open to visitors from the future.
Those wishing to attend the service, which will take place on June 15th at Westminster Abbey, have the opportunity to apply for one of 1,000 tickets that will be given out by means of a public ballot.
Intriguingly however, applications are open to anyone born before or up to the year 2038.
The peculiar choice of dates may be a nod to an experiment that Hawking conducted back in 2009 in which he announced that he was hosting a party and that time travelers were welcome to attend.
To further cement this idea, he didn't send out the invitations until after the party had taken place.
"I have experimental evidence that time travel is not possible," he said at the time.
"I gave a party for time travelers. I sat there a long time, but no one came."
Whether anyone from the future will turn up at his memorial service however remains to be seen.
"We cannot exclude the possibility of time travel as it has not been disproven to our satisfaction," said a spokesman for the Stephen Hawking Foundation. "All things are possible until proven otherwise."