Proton, with Integral safely tucked away inside, is now on the launch pad ready for today's rehearsal of the launch countdown. After years of preparation everything is almost ready for Thursday’s launch.
This, the largest of the Russian rockets, is a very impressive sight. Weighing almost 700 tonnes it is 57 metres tall with six booster engines strapped to its first stage. These will ignite 1.6 seconds before liftoff to give the huge rocket the propulsion it needs to lift it off the ground.