LONDON, Sept 19: British cosmologist Stephen Hawking has backed the right for people who are terminally ill to choose to end their lives and to receive help to do so as long as safeguards are in place. The wheelchair-bound Hawking was diagnosed with motor neurone disease aged 21 and told he had two to three years to live. Now 71, he is one of the world’s leading scientists, known especially for his work on black holes and as author of the international bestseller “A Brief History of Time”. (agencies)