NASA's Artemis II mission launched successfully from Kennedy Space Center in Florida on Wednesday, April 1, 2026, at 6:35 p.m. ET — sending four astronauts toward the Moon for the first time in more than half a century. The launch itself went as planned. But about 51 minutes into the flight, after the first critical engine burn was completed, the Orion spacecraft fell silent. Mission control lost the ability to receive data or voice communications from the crew — and, for a tense period, NASA was unable to confirm what was happening aboard the capsule.
The crew was safe. Communications were restored shortly afterward. But NASA Administrator Jared Isaacman confirmed the incident publicly at a post-launch press conference Wednesday night, and the space agency said it is actively investigating the cause of the blackout.
What Happened: The NASA Account
According to an official NASA mission blog post published April 1, the Orion spacecraft's interim cryogenic propulsion stage (ICPS) completed the perigee raise maneuver — the first engine burn, which raised the lowest point of the spacecraft's orbit to a safe altitude — approximately 50 minutes after liftoff.
"Shortly after the burn, the spacecraft experienced a loss of communications, when the ground was not able to receive data from the crew or spacecraft," NASA's official mission update stated. "It was shortly resolved, and the crew confirmed that they were able to hear communications from the ground throughout. The ground teams are looking into what might have caused the drop out."
Isaacman provided additional detail at the post-launch press conference. "About 51 minutes into the flight, during a planned handover between satellites, the Orion spacecraft underwent a communications issue, leading to a temporary partial loss," he said, according to the Daily Mail. "The uplink from Cap Com to the crew was being heard by the crew, but we can't hear the responses for a brief period of time."
Isaacman confirmed the situation was resolved. "There were no issues with the vehicle itself. Comms with the crew have been restored. We're actively working the issue," he said.
CBS News, which carried the press conference, reported Isaacman's statement that "about 50 minutes after liftoff, there was a temporary loss of communication with the Orion capsule, but that issue has been resolved." The exact cause of the disruption was described as still under investigation but was not characterized as a major concern.
ABC News confirmed that Isaacman told reporters NASA astronauts Reid Wiseman, Victor Glover Jr., and Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen, "are safe." According to engineers cited by Astronomy.com, the communications incident is not believed to be a critical issue, and the spacecraft itself was functioning normally throughout.
Mission Context: What Was Happening When Contact Was Lost
The timing of the communications loss — immediately following the first engine burn — provides context for NASA's investigation. The perigee raise maneuver is a planned, precisely timed burn that adjusts the spacecraft's lowest orbital point. During the sequence, the Orion spacecraft transitions between satellite communication systems. NASA's blog attributed the issue to "a planned handover between satellites," suggesting the blackout may have been caused by a gap or anomaly in that handover sequence rather than a hardware failure on the spacecraft itself.
CBS News documented the subsequent mission timeline. At approximately 8:52 p.m. EDT — about two hours after launch — the ICPS completed the apogee raise burn, firing for approximately 18 minutes and raising the high point of the orbit to 43,760 miles. That altitude is higher than any astronauts have flown since the final Apollo moon mission in December 1972, according to CBS News.
At approximately 9:46 p.m. EDT, the Orion capsule switched from the Tracking and Data Relay Satellites (TDRS) system to the Deep Space Network — the first time in more than 50 years a crewed spacecraft has been flying far enough from Earth to require that transition, according to CBS News.
At approximately 10:10 p.m. EDT, the crew manually took control of the Orion capsule as part of a planned test of the spacecraft's manual docking and maneuvering capabilities — a critical skill needed for future lunar landing missions. The crew handed control back to Houston at approximately 11:20 p.m. EDT after roughly a 70-minute demonstration.
Additional Issues: Toilet Troubleshooting
The communications blackout was not the only issue reported on launch day. CBS News reported that the crew was dealing with "a controller issue" with the toilet in the Orion capsule. NASA Associate Administrator Amit Kshatriya said at the press conference that the issue would take "maybe a few hours to troubleshoot." No further details about the resolution of that issue were available at press time.
The Mission Ahead
Artemis II is a ten-day crewed mission on a free-return trajectory around the Moon, according to NASA. The mission carries NASA astronauts Reid Wiseman (commander), Victor Glover, and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen — the first Canadian to travel to the vicinity of the Moon. The mission does not include a lunar landing; it is a crewed test flight of the Orion spacecraft's systems and the Space Launch System (SLS) rocket in a trajectory that takes humans deeper into space than any crewed mission since Apollo 17 in 1972.
The next major milestones include approximately 23.5 hours of system checkout in high Earth orbit before the spacecraft breaks out of Earth's gravity well toward the Moon. The crew will also have an unusual astronomical opportunity: according to NASA Acting Associate Administrator Lori Glaze, the astronauts will be able to observe a lunar eclipse from space, including the sun's corona, during their mission. Glaze described it as "a pretty cool and unique opportunity," according to CBS News.
French President Emmanuel Macron praised the launch on the platform X, calling it a moment "when History catches its breath." Macron highlighted the role of the European Space Agency, whose service module powers the Orion capsule. President Trump mentioned the Artemis II crew at the opening of his prime-time national address Wednesday night, saying "They are on their way, and God bless them," according to CBS News.
Why the Comms Incident Matters
While NASA has characterized the brief communications loss as resolved and under investigation rather than a safety concern, the incident is notable for what it illustrates about the complexity of deep-space communications. The switch from the TDRS system — which covers near-Earth orbits — to the Deep Space Network is itself a historic threshold, last crossed by a crewed spacecraft in the early 1970s. Any anomaly during that handover could have implications for how NASA manages similar transitions on future, more distant missions — including Artemis III, which is intended to land astronauts on the Moon.
The investigation NASA is conducting will likely focus on whether the issue was a one-time anomaly in the satellite handover sequence or something that requires procedural or hardware changes before the spacecraft heads to lunar distances, where communications latency and reliability become even more critical.
The mission is proceeding. The investigation into what briefly silenced it is just beginning.