NASA Artemis Program: Complete Guide to America's Return to the Moon

The Artemis program is NASA's campaign to return humans to the Moon and establish a long-term presence there for the first time in history. Named after the twin sister of Apollo in Greek mythology, Artemis picks up where Apollo left off — but with fundamentally different goals. Where Apollo was about flags and footprints, Artemis is about building infrastructure for a sustained human presence on and around the Moon.

As of March 2026, the program is at a pivotal moment. Artemis I successfully completed an uncrewed test flight. Artemis II is days away from launching four astronauts around the Moon. And the recently announced Project Ignition has committed $20 billion to building a permanent lunar base. Here is the complete guide to where Artemis stands and where it is headed.

Artemis I: The Uncrewed Test Flight (Completed)

Artemis I launched on November 16, 2022, after years of delays and several scrubbed attempts. The mission sent an uncrewed Orion spacecraft on a 25.5-day journey around the Moon and back, traveling 1.4 million miles — farther than any spacecraft designed for humans had ever flown.

Key accomplishments of Artemis I:

• First flight of the Space Launch System (SLS) rocket
• Orion reached a maximum distance of 268,563 miles from Earth
• Validated the heat shield at lunar return velocities (approximately 25,000 mph)
• Tested communication, navigation, and life support systems in deep space
• Demonstrated the European Service Module propulsion system

The mission was broadly successful, though post-flight analysis revealed that the heat shield's ablative material behaved differently than predicted during reentry — some char loss occurred in unexpected patterns. NASA determined this did not pose a safety risk but required additional analysis before committing to a crewed flight.

Artemis II: Crewed Lunar Flyby (April 2026)

Artemis II is the first crewed mission of the Artemis program. Targeting launch on April 1, 2026, at 6:24 PM EDT from Kennedy Space Center's Launch Pad 39B, the mission will send four astronauts on an approximately 10-day flight around the Moon and back.

The crew:

• Reid Wiseman (Commander) — NASA astronaut, U.S. Navy test pilot
• Victor Glover (Pilot) — NASA astronaut, first person of color to fly beyond low Earth orbit
• Christina Koch (Mission Specialist 1) — NASA astronaut, first woman to fly beyond low Earth orbit
• Jeremy Hansen (Mission Specialist 2) — Canadian Space Agency astronaut, first non-American on a lunar mission

Artemis II will not land on the Moon. It is a free-return flyby mission designed to validate that Orion's life support, navigation, and crew systems work safely at lunar distances with humans aboard. The spacecraft will fly approximately 6,400 miles above the Moon's far side before returning to Earth for a Pacific Ocean splashdown.

This mission is the critical gate that every subsequent Artemis mission must pass through. Without Artemis II proving the crew systems, there are no Moon landings.

Read our complete viewing guide: How to Watch Artemis II

The Space Launch System (SLS)

SLS is the most powerful rocket NASA has ever built and the only vehicle currently capable of sending the Orion crew module to lunar trajectories. Key specifications:

• Height: 322 feet (98 meters) in Block 1 configuration
• Thrust at liftoff: 8.8 million pounds — 15% more than the Saturn V
• Core stage engines: 4 RS-25 engines (upgraded Space Shuttle Main Engines)
• Solid rocket boosters: 2 five-segment SRBs by Northrop Grumman, each producing 3.6 million lbs of thrust
• Payload to trans-lunar injection: Over 27 metric tons (Block 1)
• Cost per launch: Approximately $2.2 billion (including ground operations)

SLS has been criticized for its cost — development exceeded $23 billion over more than a decade, and each launch costs over $2 billion with no reusability. Advocates counter that SLS provides capabilities that no other currently operational rocket can match, specifically the ability to send a fully equipped crew capsule to the Moon in a single launch without orbital refueling.

NASA has discussed evolving SLS to a Block 1B configuration with an Exploration Upper Stage (EUS) that would increase payload capacity, but this upgrade has not been funded for near-term missions.

The Orion Spacecraft

Orion is the crew vehicle for all Artemis missions. Built by Lockheed Martin with a European Service Module (ESM) provided by the European Space Agency, Orion is designed for deep space missions lasting weeks.

• Crew capacity: Up to 4 astronauts
• Crew module diameter: 16.5 feet (5.03 meters)
• Habitable volume: 316 cubic feet — about 50% more than Apollo
• Heat shield: 16.5-foot diameter, largest ever built for human spaceflight
• Solar arrays: 4 wings spanning 62 feet, generating 11 kilowatts
• Mission duration: Designed for up to 21 days (extendable when docked)
• Launch escape system: Capable of pulling the crew module away from a failing rocket in milliseconds

The European Service Module provides propulsion (33,000 N main engine plus 8 auxiliary thrusters), electrical power, thermal control, and consumable storage (water, oxygen, nitrogen). ESA's contribution to Orion is a cornerstone of international Artemis partnership.

Artemis III: Starship HLS Demonstration (Targeting 2027)

Artemis III represents a significant change from the original mission profile. Originally planned as the first crewed lunar landing, NASA restructured the mission in 2024 to serve as an Earth-orbit test of the Starship Human Landing System.

In the updated plan, Artemis III will launch an Orion spacecraft to low Earth orbit where it will rendezvous and dock with a SpaceX Starship HLS vehicle. The crew will transfer between vehicles, test systems, and validate the docking and crew transfer procedures that will be required for a lunar landing mission. This mission does not go to the Moon.

This restructuring reflected the reality that Starship HLS development — including the orbital refueling capability required for a lunar mission — needed more time. By testing the HLS in Earth orbit first, NASA reduces risk for the actual landing mission.

Artemis IV: First Crewed Lunar Landing (Targeting 2028)

Artemis IV is now planned as the first crewed lunar landing since Apollo 17 in December 1972. The mission will use SLS to launch Orion to lunar orbit, where the crew will transfer to a Starship HLS vehicle for descent to the lunar south pole.

The south pole was chosen because permanently shadowed craters in the region may contain water ice — a resource critical for future sustained operations. Astronauts will spend several days on the surface conducting science experiments, collecting samples, and testing technologies for longer-duration stays.

Blue Origin is also developing a second Human Landing System under NASA's Sustaining Lunar Development program, providing redundancy and competition. The Blue Moon lander could begin supporting Artemis missions in the early 2030s.

From Gateway to Ignition

The Artemis architecture underwent a major change in March 2026 when NASA Administrator Jared Isaacman announced Project Ignition, a $20 billion initiative to build a permanent base at the lunar south pole.

The key decision was to pause the Lunar Gateway — a planned orbital station around the Moon — and redirect those resources to surface infrastructure. Gateway's modules (HALO by Northrop Grumman and I-Hab by ESA) will be repurposed for surface habitation rather than assembled in lunar orbit.

Ignition unfolds in three phases:

• Phase 1: Build, Test, Learn (~$10 billion) — Expanded CLPS program with near-monthly robotic deliveries to test technologies at the south pole
• Phase 2: Early Infrastructure — Semi-habitable areas for astronauts, including a JAXA pressurized rover delivered by Starship (FY2032)
• Phase 3: Long-Term Presence — Full habitats from international partners, Blue Origin surface habitat (FY2033), permanent occupancy

Read our detailed analysis: NASA's $20 Billion Moon Base: Everything You Need to Know

International Partners

Artemis is an international effort involving space agencies from around the world through the Artemis Accords, a set of principles for peaceful lunar exploration. As of 2026, over 40 nations have signed the Accords.

Key partners and their contributions:

• European Space Agency (ESA): Orion European Service Module, I-Hab module (repurposed for surface), astronaut participation
• Canadian Space Agency (CSA): Canadarm3 robotic system, astronaut Jeremy Hansen on Artemis II, surface systems
• Japan Aerospace Exploration Agency (JAXA): Pressurized lunar rover, scientific instruments, astronaut participation
• Italian Space Agency (ASI): Surface habitat element for Phase 3
• Australian Space Agency: Lunar rover contribution

The Gateway pause created diplomatic tension with some partners who had committed hardware and funding to the orbiting station. However, NASA has emphasized that all international contributions are being redirected to surface roles, maintaining partner involvement.

Complete Artemis Timeline

Here is the current planned timeline for Artemis missions and milestones:

• November 2022: Artemis I — Uncrewed test flight (completed)
• April 2026: Artemis II — Crewed lunar flyby
• ~2027: Artemis III — Starship HLS Earth-orbit test
• ~2028: Artemis IV — First crewed lunar landing (south pole)
• Late 2028: Space Reactor 1 Freedom — Nuclear propulsion demonstration to Mars
• ~2029–2030: Artemis V — Second crewed landing, expanded surface operations
• FY2032: JAXA pressurized rover delivered via Starship
• FY2033: Blue Origin surface habitat delivered
• By 2033: Permanent human presence on the Moon

These dates are targets and subject to change based on technical readiness, funding, and development progress. The Artemis program has a history of schedule slips — Artemis II was originally targeted for late 2024 before sliding to 2025 and then to April 2026.

Cost and Budget

The Artemis program's total cost is difficult to pin down because it spans multiple programs, contracts, and budget lines. Key cost figures:

• SLS development: Over $23 billion through first flight
• Orion development: Over $20 billion through first flight
• SLS per-launch cost: Approximately $2.2 billion
• HLS (SpaceX) initial contract: $2.89 billion (subsequently expanded)
• HLS (Blue Origin) contract: $3.4 billion
• Project Ignition: $20 billion over 7 years
• Exploration Ground Systems: Over $5 billion

NASA's total exploration budget (which includes Artemis) is approximately $7–8 billion per year. The $20 billion Ignition initiative represents a significant increase in lunar investment, though it is spread over seven years and leverages commercial partnerships to reduce costs compared to fully government-developed systems.

Why Artemis Matters

Artemis is more than a nostalgia trip to the Moon. It represents:

• Scientific discovery: The lunar south pole has never been explored by humans. Water ice in permanently shadowed craters could reveal the history of the solar system and provide resources for sustained operations.
• Technology development: Technologies developed for the Moon — closed-loop life support, nuclear power, in-situ resource utilization, autonomous construction — are directly applicable to Mars missions.
• Geopolitical competition: China plans to land astronauts on the Moon by 2030. The United States views maintaining leadership in lunar exploration as a strategic priority.
• Commercial catalyst: Artemis is driving billions in commercial space investment, creating a lunar economy that could eventually sustain itself.
• Inspiration: The Apollo program inspired a generation of scientists and engineers. Artemis aims to do the same for the 21st century.

Follow the complete Artemis program on SpaceNexus: track the Artemis II launch, explore our cislunar ecosystem page, and compare lunar program approaches on our SpaceX vs. Blue Origin analysis.

Frequently Asked Questions

When is Artemis 2 launching?

Artemis II is targeting launch on April 1, 2026, at 6:24 PM EDT from Kennedy Space Center's Launch Pad 39B. Backup launch dates are April 7, 8, 10, and 11, 2026. The launch window is two hours.

Will Artemis land on the Moon?

Yes, but not immediately. Artemis II (April 2026) is a flyby — no landing. Artemis III (~2027) is an Earth-orbit test of the Starship landing system. Artemis IV (targeting 2028) is planned as the first crewed lunar landing since Apollo 17 in 1972, delivering astronauts to the lunar south pole.

How much does the Artemis program cost?

The total Artemis program cost spans multiple contracts and budget lines. SLS development cost over $23 billion, Orion over $20 billion, and each SLS launch costs approximately $2.2 billion. The recently announced Project Ignition adds $20 billion over 7 years for a permanent lunar base. NASA's annual exploration budget is approximately $7–8 billion.

What is the SLS rocket?

The Space Launch System is NASA's super heavy-lift rocket — the most powerful rocket ever flown. It generates 8.8 million pounds of thrust at liftoff (15% more than the Saturn V) and is the only rocket currently capable of sending the Orion crew capsule to the Moon in a single launch.

What happened to Gateway?

In March 2026, NASA announced it would pause the Lunar Gateway — a planned orbiting station around the Moon — and redirect those resources to building a surface base at the lunar south pole under Project Ignition. Gateway's modules will be repurposed for surface habitation rather than assembled in orbit.