The Cape Canaveral crew are now prepping the Space Shuttle Endeavour for a nighttime launch on a space station remodeling mission.

Preparations include filling the shuttle’s external tanks with liquid nitrogen and liquid oxygen at 10:30 a.m. Friday.

NASA officials calculated that the weather has a 70% chance of giving the Endeavour a good launch window and will give mission control the go ahead for the 7:55 p.m. launch. About a fourth of all shuttle missions start at night.

The Endeavour is heading over to the International Space Station(ISS) to deliver and rework a new bathroom, kitchenette, an exercise machine, two bedrooms and a system capable of turning urine into drinking water.