NASA is broadcasting a live feed of the Artemis II moon rocket from the Kennedy Space Center on Merritt Island, Florida.

Teams are activating the ground launch sequencer, the computer that will initiate terminal count -- the final, automated 10 minutes of launch countdown -- which will tell the rocket when to lift off.

Engineers are also initiating the air‑to‑gaseous nitrogen changeover inside the rocket's cavities. NASA says atmospheric air is replaced with inert nitrogen gas, which creates a stable environment before fueling operations.

Watch the live feed here.

The Artemis II moon mission will see four astronauts go on a 685,000-mile, 10-day journey around the moon. Here is what the timeline looks like:

Day 1 is launch day. The astronauts lift off aboard NASA's newest spacecraft, Orion, which will sit atop the Space Launch System rocket. The spacecraft will reach initial orbit and then high-Earth orbit to make a push toward the moon.

Days 2 through 4 are transit days, with the journey to the moon taking three days. Over the course of the journey, the crew will continue to evaluate Orion's systems and practice emergency procedures, in addition to other activities.

On day 5, Orion will enter the lunar sphere of influence, meaning the moon is the main gravitational pull. On day 6, the crew will come its closest to the moon while traveling the farthest from Earth, according NASA.

Days 7 through 10 will see the astronauts make their way back to Earth before re-entering Earth’s atmosphere at high speed, up to 25,000 miles per hour.

The Orion spacecraft will deploy a series of parachutes once through the heat of re-entry to slow down and it will splash down in the Pacific Ocean The U.S. Navy will recover the capsule.

-ABC News’ Mary Kekatos

#Who are the Artemis astronauts?

Three Americans and one Canadian will be aboard the Orion spacecraft -- named "Integrity" -- over the course of 10 days.

The team consists of Victor Glover, Christina Hammock Koch and Reid Wiseman of NASA and Jeremy Hansen of the Canadian Space Agency.

Wiseman is the commander of the Artemis II mission, Glover is the mission pilot, and Koch and Hansen are mission specialists.

Glover and Koch will also be the first person of color and first woman, respectively, to eventually step foot on the lunar surface in future Artemis missions.

-ABC News' Julia Jacobo

Artemis II took astronauts around the moon for the first time in more than 50 years. The four-person crew launched from NASA's Kennedy Space Center on Merritt Island, Florida, on April 1 for a 10-day journey, with the splashdown set for Friday off the California coast.

The history-making trip will pave the way for future Artemis missions intended to eventually see astronauts set foot on the moon and the building of a permanent lunar base.

Read more here about what you need to know regarding the Artemis II mission, including who the astronauts are and how to watch.

Splashdown remains tentatively scheduled for 8:07 p.m. ET on Friday, likely within 100 miles of the San Diego coast, according to NASA. However, the exact timing could still change depending on various conditions.

Weather-wise, it's still looking like a go with no big changes to the forecast at this time. The criteria required for splashdown are expected to be met off the coast of San Diego. Rain should remain well to the north of the region, and clouds shouldn't exceed the safety threshold.

While conditions continue to look favorable, weather and ocean conditions will remain closely monitored right up to retry to determine if any small trajectory shifts are required to ensure the Orion spacecraft arrives home in the most favorable conditions possible.

Weather criteria needed for a nominal splashdown and recovery, according to NASA, are:

-Significant wave height must be less than six feet
-No precipitation or lightning within 35 miles
-Winds under 28 mph
-Good visibility and minimal cloud cover below a certain height

-ABC News' Daniel Peck