Famed physicist Stephen Hawking has said that he would consider assisted suicide -- but only if he were in great pain, felt like a burden to loved ones or had nothing left to contribute to the world.


Hawking, 73, suffers from motor neurone disease, and has argued that keeping someone alive against their own wishes is the "ultimate indignity".


In 2013, Hawking had said that terminally ill patients should have access to assisted suicide, as long as there are checks to prevent abuse.


In an interview for a new BBC programme, the scientist disclosed he suffered bouts of loneliness, because people can be afraid to talk to him or let him answer.


When asked about his support for assisted dying, and what condition he would have to be in to consider it for himself, the physicist said: "To keep someone alive against their wishes is the ultimate indignity.


"I would consider assisted suicide only if I were in great pain or felt I had nothing more to contribute but was just a burden to those around me," he said.


But, Hawking added: "I am damned if I'm going to die before I have unravelled more of the universe."