NASA is just hours away from launching the most powerful rocket the world has ever seen. Lift-off from Cape Canaveral in Florida will take place between 08:33 and 10:33 ET (13:33 and 15:33 BST).
When Astronaut Jim Lovell said Houston, We've had a problem. The person in mission control to hear it was Grand Rapids native, astronaut Jack Lousma, CapCom.