Nasa began the countdown on Monday for humanity’s first launch to the moon in 53 years.The 32-storey Space Launch System rocket is poised to blast-off on Wednesday evening with four astronauts.After a day in orbit around Earth, the Orion capsule will propel the astronauts to the moon and back. There are no stops – just a quick U-turn around the moon.The nearly 10-day flight will end with a splashdown in the Pacific.Managers said the rocket is doing well following the latest round of repairs....