March 2026 will be remembered as the month humans started going back to the Moon. On the evening of April 1 — just barely past the month’s final page — NASA’s Artemis II lifted off from Kennedy Space Center’s Launch Complex 39B, sending four astronauts on a trajectory around the Moon for the first time since Apollo 17 in December 1972. But the month leading up to that historic launch was packed with its own milestones, from a flagship telescope reaching completion to a new European navigation constellation taking its first breath in orbit.
Let’s look at what happened.
Artemis II: From Countdown to Liftoff
The biggest story of the month — and arguably the year — began long before the engines ignited. March opened with SLS and Orion already at Pad 39B following a second rollout on March 20, and the entire month was consumed by the deliberate, choreographed buildup to launch day.
NASA published its full countdown timeline in late March, revealing the detailed decision architecture behind a crewed heavy-lift launch: 49 hours of sequenced operations, cryogenic loading milestones, crew boarding procedures, planned holds, and explicit recycle logic showing where the launch team could recover from a scrub and where they couldn’t.[1] For space operations enthusiasts, this was the real story — the mechanics of how you actually launch four people toward the Moon.
The crew — commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen — entered quarantine in Houston on March 18 and arrived at Kennedy Space Center on March 27.[2] Together, they represent a series of firsts: Glover becomes the first Black astronaut to leave low Earth orbit, Koch the first woman, and Hansen the first non-American to fly to the Moon’s vicinity.
Launch day itself carried some drama. Engineers worked through a flight termination system communication issue and investigated an anomalous temperature sensor on the launch abort system, both resolved before the terminal count.[3] Weather cooperated at 90% favorable. At 6:35 p.m. EDT on April 1, the SLS rocket’s twin solid boosters and four RS-25 engines generated 8.8 million pounds of thrust, and Artemis II climbed away from Florida into a deepening twilight sky.[3]
Within minutes, the boosters separated, the launch abort system jettisoned, and the core stage completed its burn. Orion — named Integrity for this mission — deployed its four solar array wings, each spanning roughly 63 feet, and began drawing power from 15,000 solar cells per wing.[3] As of this writing, the crew is in Earth orbit preparing for the perigee raise maneuver (a burn to lift the lowest point of their orbit) and the proximity operations demonstration, where they’ll manually fly Orion near the spent upper stage — a critical test for future docking scenarios.
The approximately 10-day mission will take the crew some 252,000 miles from Earth, setting a new record for the farthest humans have ever traveled — surpassing the Apollo 13 crew’s 248,000-mile mark from 1970.[4]
Roman Space Telescope: Construction Complete
While the world’s eyes were on Artemis, another flagship mission quietly hit a major milestone. NASA announced that the Nancy Grace Roman Space Telescope has completed construction and is wrapping up final prelaunch testing at Goddard Space Flight Center.[5] The agency is planning an April 21 media event — one of the last opportunities to see the fully assembled observatory before it ships to Kennedy Space Center for a launch expected later this year.
Roman will carry a field of view 100 times wider than Hubble’s, designed to survey billions of galaxies, study dark energy, and directly image exoplanets using its coronagraph instrument. For the space science community, this telescope represents the next generational leap in wide-field infrared astronomy. Its completion — on schedule — is a welcome counterpoint to the long development sagas that have defined other flagship missions.
Rocket Lab Delivers Europe’s Celeste Navigation Satellites
On March 28, Rocket Lab launched the first two satellites for the European Space Agency’s Celeste navigation constellation from Launch Complex 1 in New Zealand.[6] The mission, named “Daughter of the Stars,” was Rocket Lab’s 85th Electron launch and its first dedicated mission for ESA.
Celeste is designed to complement Europe’s Galileo system by adding a low Earth orbit navigation layer, improving resilience and coverage. ESA hopes to have the full constellation operational by 2027. For Rocket Lab, the launch validated the company’s expanding role beyond small-satellite delivery into strategic infrastructure for allied space agencies — a trajectory reinforced by the company’s pending acquisition of optical communications firm Mynaric, which received regulatory approval in late March.[7]
Hubble Catches a Comet Spinning in Reverse
In a fascinating science story that flew under most radar, NASA revealed that Hubble Space Telescope observations of comet 41P/Tuttle-Giacobini-Kresák showed the small comet slowing its rotation dramatically, nearly stopping, and then appearing to begin spinning in the opposite direction.[8] The culprit: outgassing jets acting like tiny thrusters, applying enough torque over time to reverse the nucleus’s spin.
It’s a rare, real-time demonstration of how small comets evolve and destabilize — and a reminder that 36-year-old Hubble is still producing genuinely novel science from its archive data.
Arctic Sea Ice Ties Record Low — Again
NASA and the National Snow and Ice Data Center reported that Arctic winter sea ice peaked on March 15 at approximately 5.52 million square miles, statistically tied with 2025 for the lowest winter maximum in the satellite record.[9] ICESat-2 observations added that much of the remaining ice is thinner than previous years, providing physical depth context that extent measurements alone can’t capture.
This is the kind of Earth-observation story that illustrates why space-based monitoring matters: long-term, consistent measurement from orbit is the only way to track changes at this scale with this precision.
Looking Ahead: April 2026
April is going to be dominated by the ongoing Artemis II mission. Key milestones to watch:
- Early April — Translunar injection burn (the engine firing that sends Orion out of Earth orbit and toward the Moon) on flight day two
- Mid-April — Lunar flyby at approximately 4,700 miles above the lunar surface, setting a new distance record
- ~April 10 — Planned splashdown in the Pacific Ocean, testing Orion’s heat shield at approximately 25,000 mph reentry speed
- April 21 — NASA media event for the completed Roman Space Telescope at Goddard
- Ongoing — SpaceX continues Starship development toward the lander variant needed for Artemis III/IV
If Artemis II closes cleanly, the conversation shifts immediately to what comes next: Artemis III (now a test mission under Administrator Isaacman’s restructuring) and the first crewed lunar landing, currently targeting 2028.
March was the month the countdown started. April is the month we find out if the architecture works.
Sources
[1] NASA, “NASA Releases the Full Artemis II Moon Mission Launch Countdown,” March 2026. Link
[2] NASA, “NASA Teams Readying Artemis II Moon Rocket for Launch,” March 31, 2026. Link
[3] NASA, “LIVE: Artemis II Launch Day Updates,” April 1, 2026. Link
[4] Reuters, “NASA launches four astronauts on world’s first crewed lunar mission in half a century,” April 1, 2026. Link
[5] NASA, “NASA to Unveil Complete Roman Telescope, Host Media Briefing,” March 2026. Link
[6] Rocket Lab, “Rocket Lab Successfully Launches 85th Mission and First Dedicated Launch for European Space Agency,” March 28, 2026. Link
[7] Rocket Lab, corporate updates, March 30, 2026. Link
[8] NASA, “NASA’s Hubble Detects First-Ever Spin Reversal of Tiny Comet,” March 2026. Link
[9] NASA, “Arctic Winter Sea Ice 2026,” March 2026. Link
