ISRO chairman S Somanath on Thursday said space science is not just about the excitement of becoming astronomers, but it also involves complex and time-consuming science, an expertise that can only be built persistently over the years. Somanath, who is also Secretary, Department of Space, was delivering a keynote speech at the virtual launch of the third edition of ISRO's Space Science and Technology Awareness Training (START 2025) programme. This year, 20,000 students from over 560 institutions have registered for the START programme that will be held from January 9 to 29, added Somanath. Although the mysteries of the universe quite naturally become the primary focus of attention, Somanath said space science is more about crunching numbers and cracking heads over formulae, to, say, optimally design sensors or build satellites and rockets. So, in the START programme, we will be talking about all of these. We will be talking about our exciting space missions. But we'll also tell you