Hong Kong - World-renowned physicist Stephen Hawking Tuesday predicted that man would have a lunar settlement within 20 years and a colony on Mars by 2046. Speaking on a visit to Hong Kong, he said space exploration would be essential for the survival of man because of the threat of nuclear war and diminishing resources. According to radio station RTHK, the wheelchair-bound 64-year-old author of A Brief History Of Time said the risk of total annihilation of the human race was growing day by day. He told a press briefing that he believed man would have a settlement on the moon within 20 years and a colony on Mars within 40 years, RTHK said. Briton Hawking, who will deliver a lecture titled The Origin Of The Universe on Thursday at a Hong Kong university, has been given a rock star style reception in the former British colony. Police had to form a human chain to hold back crowds waiting to greet him when he touched down at the city's Chek Lap Kok airport on Monday. My question = Have you got any development plans?