(FOX NEWS) — We have crossed the T-minus 6-hour mark, and the path to the Moon is looking clearer by the minute. At this stage, the Space Launch System (SLS) rocket is almost entirely flight-ready; the core stage is now fully fueled and holding steady in replenish mode, while the upper stage (ICPS) is in the final stages of loading its liquid oxygen.

Inside the Astronaut Crew Quarters, the mood is one of focused preparation. The four-person crew is preparing to attend their final weather briefing, where they are being briefed on the developing showers near the pad and the 80% favorable conditions for their 6:24 p.m. ET liftoff.

Once the briefing concludes, they will move into their pre-flight meal and begin the meticulous process of suiting up in their Orion Crew Survival System suits. With the hardware performing beautifully and the crew nearing their departure for the pad, the reality of today’s historic mission is truly setting in.