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

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