Coverage of the launch, and now the postponment, can be followed in real time on NASA TV, or on the internet via NASA TV on the NASA.gov web site.
Endeavour was to begin its final journey into space today from the Kennedy Space Center just a little before 4PM local time today. Just before noon time at KSC NASA officials announced that the launch would have to be scrubbed for today.
The shuttle has internal auxiliary power units (APU) which provide back-up internal power to the shuttle and the heaters which are a critical part of the proper operation of the APU were reportedly having technical issues.
During its 2 week mission the Endeavour is scheduled to visit the International Space Station delivering an EXPRESS Logistics Carrier-3 and an Alpha Magnetic Spectrometer, as well as some supplies.
The date for the next launch attempt, of what will be the second to the last shuttle mission for NASA, has not yet been announced.