Artemis II Crew Enters Moon’s Sphere of Influence
Astronauts aboard NASA’s Orion capsule have entered the moon’s “sphere of influence,” a region where the moon’s gravitational pull on the spacecraft surpasses that of Earth. This transition occurred approximately 39,000 miles (62,800 km) from the moon and 232,000 miles (373,400 km) from Earth, four days, six hours, and two minutes into the mission.
The next significant milestone for the crew will be their journey later on Monday to the far side of the moon, venturing deeper into space than any humans have before.
“We’re all extremely excited for tomorrow,” Lori Glaze, deputy associate administrator for NASA’s Exploration Systems Development Mission, said on Sunday. “Our flight operations team and our science team are ready for the first lunar flyby in more than 50 years.”
Historic Lunar Mission Resumes After Half a Century
The four astronauts on Artemis II are the first humans bound for the moon in over 50 years, continuing the legacy of the Apollo program that concluded in 1972. While Apollo missions flew approximately 70 miles above the lunar surface, Artemis II will approach to just over 4,000 miles at its closest point. This proximity will allow the crew to observe the moon’s entire spherical surface, including regions near both poles.
During the roughly six-hour flyby, the astronauts will observe the moon with their naked eyes and onboard cameras. This mission promises views of the moon’s far side that were previously too dark or difficult to see for the 24 Apollo astronauts who preceded them.
As Orion passes behind the moon, the mission will enter a planned communications blackout lasting about 40 minutes, during which the lunar surface will block radio signals needed for the Deep Space Network to maintain contact with the spacecraft.
“I think it’s important to remember that we don’t always know exactly what they’re going to see,” Kelsey Young, lead scientist for the Artemis II mission, said during a press conference on Sunday.
Potential Record-Breaking Distance from Earth
If the mission proceeds smoothly, the astronauts—Americans Christina Koch, Reid Wiseman, and Victor Glover, along with Canadian Jeremy Hansen—could set a new record for the farthest distance from Earth traveled by humans.
The crew has already witnessed lunar surface features never before seen by human eyes. Early Sunday, NASA released an image taken by Artemis II showing the distant moon with the Orientale basin, sometimes called the moon’s “Grand Canyon,” clearly visible.
“This mission marks the first time the entire basin has been seen with human eyes,” NASA stated. The large crater, resembling a bullseye, has previously been photographed by orbiting cameras.
As the crew began day five of the 10-day mission, the Orion spacecraft was nearly 215,000 miles (346,000 km) from Earth and 65,000 miles from the moon, according to NASA’s online dashboard.
Former astronaut Charlie Duke, who walked on the moon during Apollo 16 in 1972, gave the ceremonial wakeup call to the crew.
“Below you on the moon is a photo of my family. I pray it reminds you that we in America and all of the world are cheering you on. Thanks to you and the whole team on the ground for building on our Apollo legacy with Artemis,” said the 90-year-old Duke.
Mission Operations and Spacecraft Systems
NASA reported that the Artemis crew completed a manual piloting demonstration and reviewed their lunar flyby plan, including the surface features they must analyze and photograph during their orbit around the moon.
Simultaneously, NASA’s chief Jared Isaacman emphasized the focus on the spacecraft’s ecosystem and life support systems.
“This is the first time astronauts have ever flown on this spacecraft before. That’s what we’re most interested in getting data from,” Isaacman said during a televised interview with CNN on Sunday.
On day five, the astronauts tested their “survival” suits, bright orange garments worn during takeoff, re-entry, and emergency situations such as cabin depressurization.
Although the astronauts will not land on the lunar surface, they are expected to break the record for the farthest distance from Earth during their pass around the moon.
“Over the next day, they will be on the far side of the moon, they will eclipse that record, and we’re going to learn an awful lot about the spacecraft,” Isaacman said.
The data collected will be crucial for planning subsequent missions, including Artemis III in 2027 and the lunar landing planned for Artemis IV in 2028.
