The 28 hour countdown for ISRO's historic launch of PSLV C-37 carrying 104 satellites begins early morning tomorrow. <br/><br/>The rocket carrying India's principal payload Cartosat-2 Series and 103 other co-passangers would lift off from the first launch pad of the Satish Dhawan Space Centre, Sriharikotta at 9.28 hours on Wednesday. <br/><br/>This is considered to be the world's highest number of satellites to be inserted into space in a single launch. The countdown is set to start at 5.28 hrs in the morning tomorrow. <br/><br/>PSLV C-37 would fly in its extended version this time carrying strap on motors to give the needed extra thrust to carry more weight. <br/><br/>Apart from the principal payload Cartosat-2 Series satellite and two more nano-satellites weighing below 10 kilogram, the 101 other co-passangers are from foreign countries. They include one each from Israel, Kazakhstan, the Nederland, Switzerland and the United Arab Emirates and 96 from the US.