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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

British actors Lily Cole, Eddie Redmayne and Felicity Jones leave Great St Marys Church, where the funeral of theoretical physicist Prof Stephen Hawking was held, in Cambridge, Britain, March 31, 2018. REUTERS/Henry Nicholls 

Jane Hawking and her son Timothy follow 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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

Comedian Dara O'Briain arrives at 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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

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. REUTERS/Henry Nicholls 

British actor Felicity Jones and film director Charlie Guard arrive at 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 

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. REUTERS/Henry Nicholls 

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 

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. REUTERS/Henry Nicholls