Latest news: Final preparations under way at Cape Canaveral in Florida to put first US lander on moon for 50 years
United Launch Alliance spokesperson Amanda Sterling has said everything is on track for launch at this stage.
She said:
We are currently holding at T-minus seven minutes as part of our planed 60 minute hold, and the team is not working any issues at this time.
The Vulcan booster is fuelled to flight level with super-chilled liquid oxygen and liquid methane … and the ULA team is on track for an on-time lift off at 2.18am Eastern (7.18am GMT).