Correction: An earlier version of this article incorrectly stated that Stephen Hawking was studying at Oxford University when he was told he had only two years to live. Hawking was studying at Cambridge University at the time. This version has been corrected.

Physicist Stephen Hawking smiles during a news conference on the conference on string theory named 'Strings 1999', held at the University of Potsdam, near Berlin, Germany Wednesday, July 21, 1999. Hawking remains confident that physicists will prove string theory, a so-called ``theory of everything'' to explain the universe, but said Wednesday it might take longer than he had expected. (AP Photo/Markus Schreiber) Original Filename: GERMANY HAWKING.jpg ORG XMIT: BER104 (MARKUS SCHREIBER/AP)

Renowned physicist Stephen Hawking would consider assisted suicide if he felt he had become a burden to those around him or if he had nothing more to contribute to science, he has said in an interview.

Hawking, who suffers from motor neurone disease and has used a wheelchair since the 1960s, also said he sometimes gets “very lonely” because people can be afraid to talk to him or will not wait for him to answer.

Hawking’s illness, which is also known as Lou Gehrig’s disease, has slowly paralyzed him over the decades. He now communicates using a single cheek muscle through a speech synthesizer.

Hawking, 73, made his comments in an interview for a new program for the British Broadcasting Corp., the London Times newspaper reported Thursday.

“To keep someone alive against their wishes is the ultimate indignity,” Hawking said in the interview. The physicist, whose book “A Brief History of Time” spent 237 weeks on the British Sunday Times bestseller list, used to oppose assisted suicide, but he said he has changed his mind.

“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,” Hawking said in the interview. He added, however, that at the moment, he still had scientific contributions to make. “I am damned if I’m going to die before I have unraveled more of the universe,” he said.

One of his best-known scientific theories is the notion that black holes emit radiation, which has become known as Hawking radiation. He has been the recipient of the Presidential Medal of Freedom, the United States’ most prestigious civilian award.

The scientist, who has traveled widely, has been married twice and has three children. His early life — he was told at age 21 while studying at Cambridge University that he had only two years to live — was depicted in the 2014 biographical film “The Theory of Everything.” Despite his disabilities and his difficult communication style, Hawking is known as a man with a serious sense of humor.

He told the BBC that he was not in pain but suffers from discomfort because he cannot adjust his position in his wheelchair. The interviewer, Dara O Briain, who has a degree in theoretical physics, praised Hawking for his “impressively honest answers, even to the most direct questions.”

Asked by O Briain whether he ever gets lonely, Hawking answered: “At times I get very lonely because people are afraid to talk to me or don’t wait for me to write a response. I’m shy and tired at times. I find it difficult to talk to people I don’t know.” The scientist is currently testing a more sophisticated communication method.

It is illegal in Britain to help people end their lives. Britons who wish to do so often travel to the Dignitas clinic in Zurich. So far, however, no one has been prosecuted for helping someone end his or her life there.

A bill has been presented in Britain’s House of Lords to change the law to allow doctors to prescribe lethal doses of medication for terminally ill patents who have six months or less to live.

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