Eminent physicist Rajagopala Chidambaram, who played a key role in the nuclear tests of 1975 and 1998, died on Saturday. He breathed his last at 3:20 am in Mumbai, according to the Department of Atomic Energy (DAE). The entire nation is mourning the death of a world-class physicist and one of India’s most distinguished scientists. Prime Minister Narendra Modi also expressed his condolences over Dr Chidambaram’s demise.