NASA has delayed the launch of Space Shuttle Endeavour by one day.
Officials changed the launch day from next Tuesday to Wednesday at 5:36 p.m.
Endeavour remains on the launch pad at Kennedy Space Center in Florida as workers finish up a number of pre-launch tasks. NASA says they got a little behind on that work because they had to replace a pressure relief valve in the crew cabin.
Endeavour's crew arrived at Kennedy today to begin final preparations for the launch.
The seven astronauts will be busy with briefings, medical exams and landing practice in shuttle training aircraft.