Overnight, the Artemis II crew wrapped up a busy stretch of work in deep space, including a hands-on test of Orion's controls and more prep for Monday's lunar flyby.

According to NASA, the crew began a manual piloting demonstration at 9:09 p.m. ET, with mission specialists Christina Koch and Jeremy Hansen taking turns flying the spacecraft.

For about 41 minutes, they tested how Orion responds in different thruster modes to see how it handles both full, free movement and more limited steering. The goal is to give engineers a better sense of how the spacecraft performs when astronauts are actively flying it, NASA said.

NASA said the test is part of a series of evaluations, with commander Reid Wiseman and pilot Victor Glover expected to run a similar demonstration later in the mission -- on April 9 -- to give teams on the ground more data from different pilots.

Earlier in the day, the crew also spent time going over their plan for the lunar flyby. According to NASA, they reviewed a list of specific features on the moon's surface that scientists want them to photograph and describe.

That work will come into play on Monday, when Orion begins its flyby at 2:45 p.m. ET.

All of this is setting the stage for one of the most anticipated parts of the mission: when astronauts will see the moon up close and help document it in real time for scientists back on Earth.

The crew shared a new photo of the moon during day 4 of their mission, capturing parts of the lunar far side including Orientale basin peeking through from the right side of the lunar disk.

"This mission marks the first time the entire basin has been seen with human eyes," NASA said in an Instagram post.

-ABC News' Briana Alvarado

NASA leaders addressed a minor smell reported by the crew Saturday morning, prompting checks by the flight team.

"So we did actually look at our power data, our heater data," Orion deputy program manager, Debbie Korth said in a news conference. "Nothing looks anomalous."

She also added that a similar smell was reported on the ground, which could possibly point to a mechanical source.

“The teams are, looking at some data we have on the ground with that same similar type smell had been reported and think it might be more mechanical in nature, some tapes and some other materials that might be off casting, but really early in that investigation, so don't think there's any hazardous condition,” Korth said.

-ABC News' Briana Alvarado

NASA leaders confirmed Monday's lunar flyby will allow the crew to see parts of the moon humans have never seen before.

NASA's Science Mission Directorate lead Kelsey Young explained Saturday that parts of the lunar far side remain unfamiliar to human eyes because the Apollo missions were planned to launch when the near side was illuminated.

"So as they get closer, they'll be able to see features that human eyes have never before seen," Young at a news conference.

NASA's SLS (Space Launch System) Program John Honeycutt noted that even regions just imaged by robotic spacecraft are now visible to humans, referring to a photo taken from Orion on Friday.

The crew will also witness a solar eclipse during the mission lasting about 53 minutes, occurring an hour after Earthrise. 

-ABC News' Briana Alvarado

NASA released a brand-new high-resolution "selfie" of Orion in space.

The space agency says the image was taken with a camera mounted on one of the spacecraft’s solar array wings during a routine inspection on the second day of the Artemis II mission.

The Artemis crew has several items on their agenda for the fourth day of their mission.

At 9:10 p.m. ET, the space agency says Victor Glover will take manual control of Orion for a scheduled deep‑space handling test to see how the spacecraft responds to different maneuvers far from Earth.

In addition, NASA flight controllers have scheduled a 24‑hour acoustics test to help engineers better understand sound levels inside Orion’s cabin.

-ABC News' Briana Alvarado

Following the path of Artemis II may be confusing as the astronauts, mission control and others use specific jargon and phrases.

Here are explanations of some of the terminology people may hear over the course of the mission:

Translunar injection burn

The translunar injection burn is the final step that sends the crew on the path to the moon, committing the Orion spacecraft to the remainder of its 10-day mission.

Lasting just minutes, it's a single-engine firing that propels the spacecraft out of Earth's orbit and on a "free-return trajectory."

Universal waste management system

The universal waste management system, otherwise known as a space toilet, is located inside a stall just like in a public restroom on Earth, according to NASA.

Space toilets use air flow to pull urine and feces away and into receptacles, which are stored for disposal. The astronauts have a handlebar to hold themselves down while using the toilet in the absence of gravity.

Read more here about the terms and jargon you may come across during the Artemis II mission.