Time travellers will be welcome at the memorial service for physicist Stephen Hawking
Website for a giveaway for tickets to the ceremony allows applicants to select dates of birth that are 20 years from now

The public ballot for tickets to Stephen Hawking’s thanksgiving service opened Saturday – with visitors from the future welcome to apply.
The theoretical physicist who captured the imagination of millions around the world died on March 14 at the age of 76.
His ashes are being interred on June 15 at London’s Westminster Abbey, by the graves of fellow scientific giants Isaac Newton and Charles Darwin.
The world-renowned cosmologist’s three children Robert, Lucy and Tim are offering up to 1,000 free tickets to the public through a ballot system, run by the Stephen Hawking Foundation.
Applicants need to give their birth date – but eagle-eyed fans of the man who dedicated his life’s work to unravelling the mysteries of the universe spotted that it can be any day up to December 31, 2038.