Setting the agenda for the Indian space programme over the next 50 years, President A P J Abdul Kalam today exhorted the Indian Space Research Organisation (ISRO) scientists to aim at inhabiting Mars and procuring materials from Moon. In a tele-conference address to a function at the Vikram Sarabhai Space Centre (VSSC) here to mark the 40th anniversary of India’s first rocket launch on November 21, 1963, Dr Kalam said from New Delhi that there were many challenges ahead for the country’s space programme.