The funeral cortege arrives at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

British actor Eddie Redmayne arrives at Great St Marys Church, where he is giving a reading at the funeral of theoretical physicist Prof Stephen Hawking, in Cambridge, Britain, March 31, 2018.

Jane Hawking and her son Timothy arrive at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Pallbearers carry the coffin into Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Musician Brian May and actor Anita Dobson arrive at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Members of the public and media photograph the funeral cortege as it arrives at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Pallbearers carry the coffin out of Great St Marys Church at the end of the funeral of theoretical physicist Prof Stephen Hawking, in Cambridge, Britain, March 31, 2018.

British actor and model Lily Cole arrives at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Members of the church choir arrive at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

A floral tribute left outside Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018. Reuters/Henry Nicholls

University of Cambridge college porters arrive at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Crowds gather outside Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

The funeral cortege arrives at Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking is being held, in Cambridge, Britain, March 31, 2018.

Pallbearers carry the coffin out of Great St Marys Church at the end of the funeral of theoretical physicist Prof Stephen Hawking, in Cambridge, Britain, March 31, 2018.