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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteSpace Launch System (SLS) and Starship are not competing versions of the same Artemis rocket. SLS is NASA’s Earth-to-Moon crew launcher: it sends Orion, astronauts and mission hardware from Earth toward lunar orbit in one launch. Starship HLS is the lunar-orbit-to-surface lander being developed for Artemis III and Artemis IV. Astronauts are planned to launch on SLS and Orion, transfer to the landing system in lunar orbit, descend to the surface and return to lunar orbit.
That division makes the comparison less about choosing a single winner and more about comparing two mission segments. SLS has NASA-published lunar-injection payload figures and an established crew-launch role. Starship HLS promises a reusable, potentially higher-throughput landing system, but its lunar configuration remains in development and must complete an uncrewed demonstration before carrying people.
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What each system is built to do
The most important distinction is the destination each vehicle serves. SLS performs the high-energy departure from Earth. Its upper stage sends Orion and its crew toward the Moon, a trajectory commonly described as translunar injection (TLI). Orion then operates as the crew’s spacecraft for the outbound and return portions of the mission.
Starship HLS performs a different job. NASA’s Human Landing Systems program describes SpaceX’s lander as a vehicle that will carry astronauts from lunar orbit to the surface and back for Artemis III and Artemis IV. It is therefore the descent-and-ascent element of the architecture, not the Earth-launch vehicle that replaces SLS in the cited plan.
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Both systems are called heavy-lift vehicles in ordinary discussion, but “heavy lift” does not identify a common delivery point. A rocket can carry a large mass to low Earth orbit (LEO) yet deliver a different mass to TLI, and a lunar lander’s useful payload is measured at the surface rather than at Earth departure. Those destinations must be kept separate for a fair comparison.
How an Artemis crewed mission uses them
- Launch from Earth: SLS lifts Orion and its crew from the Space Launch System launch site. The rocket’s core stage, RS-25 engines and twin five-segment solid boosters provide the initial acceleration.
- Earth departure: SLS’s upper-stage burn places Orion on a lunar-bound trajectory. NASA describes SLS as capable of delivering crew and/or cargo directly to the Moon in a single launch across the 239,000-mile (384,633-kilometer) distance, at speeds up to 24,500 mph.
- Transit and lunar orbit: Orion carries the crew to the vicinity of the Moon and supports the mission’s crewed spacecraft functions.
- Transfer to the lander: For the planned Artemis III and IV architecture, astronauts move from Orion to Starship HLS while in lunar orbit.
- Descent and surface operations: Starship HLS takes the crew to the lunar surface, supports the landing mission and then launches them back to lunar orbit.
- Return: The crew rejoins Orion for the journey back to Earth. The lander and the SLS launch vehicle have served different portions of the same expedition.
This sequence explains why calling Starship HLS an “SLS replacement” is misleading for the architecture NASA currently describes. A change to one segment could eventually alter the overall plan, but the cited Artemis design assigns Earth departure to SLS and lunar landing to Starship HLS.
Side-by-side comparison
| Comparison point | SLS | Starship HLS | How to interpret it |
|---|---|---|---|
| Primary mission segment | Earth launch and direct crew/cargo delivery toward the Moon | Lunar-orbit-to-surface-and-back landing mission | They are complementary elements in the current Artemis architecture. |
| Named crew vehicle | Orion launches on SLS | Starship HLS is the lander; astronauts transfer from Orion in lunar orbit | Comparing the complete missions requires considering Orion, SLS and the lander together. |
| Published lunar payload | More than 27 metric tons for Block 1 crew configuration; approximately 38 metric tons for Block 1B crew configuration; approximately 42 metric tons for Block 1B cargo-only configuration | No complete, current, like-for-like official lunar payload figure is supplied for the developing HLS configuration | SLS numbers are specified TLI capabilities, not Starship surface-delivery numbers. |
| Propulsion | Four RS-25 liquid-hydrogen/liquid-oxygen engines plus two five-segment solid boosters on the initial configuration | Specific current HLS propulsion and flight-performance figures are still being developed | Do not infer an operational Starship HLS performance number from a different Starship configuration. |
| Reusability | Artemis SLS flights use an expendable launch vehicle | Reusability and higher flight cadence are design objectives, not yet flight-proven lunar-service results | “Reusable” describes the intended operating model, not a demonstrated HLS record. |
| Crew status | NASA has specified SLS as the Artemis crew launcher | NASA requires an uncrewed lunar demonstration before crew use | Starship HLS remains a development program for this role. |
| Cost basis available here | Included in NASA’s broader Artemis development portfolio | Included in the Human Landing System development portfolio | The available GAO figures are development baselines, not per-launch prices. |
SLS capability: what the published numbers mean
Block 1
The initial SLS configuration combines four RS-25 engines on a liquid-hydrogen/liquid-oxygen core stage with two five-segment solid rocket boosters. NASA gives the combination approximately 8.8 million pounds of liftoff thrust. In crew configuration, NASA lists an initial lunar TLI capability of 59,000 pounds, or about 27 metric tons, in a NASA Marshall Space Flight Center technical paper dated 2025. NASA’s public description rounds this to more than 27 metric tons to the Moon.
The 27-ton figure is not a payload-to-the-lunar-surface number. It describes what the Block 1 crew configuration can send on the outbound translunar leg, including the spacecraft and mission hardware that must continue toward the Moon. A reader should not compare it directly with an unqualified claim about how many tons a lander could place on the surface.
Block 1B
NASA describes Block 1B as the more powerful successor and the primary crew-transport rocket for later Artemis missions. It retains the liquid-hydrogen/liquid-oxygen core and five-segment boosters, with combined liftoff thrust still listed at approximately 8.8 million pounds. The major upgrade is the upper-stage and payload capability rather than a change to the basic booster-and-core arrangement.
NASA’s 2025 Marshall technical figures are approximately 84,000 pounds (38 metric tons) of crewed TLI capability for Block 1B and 93,000 pounds (42 metric tons) in a cargo-only configuration. Cargo-only performance is higher because the vehicle does not have to accommodate the same crew spacecraft and mission requirements. The two values should not be treated as interchangeable.
NASA’s single-launch claim
“SLS is the only rocket capable of delivering crew and/or cargo directly to the Moon in a single launch across the 239,000-mile (384,633-km) expanse at speeds up to 24,500 mph.”
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This is a statement about NASA’s specified capability and the launch systems considered on that reference page. It does not mean SLS performs the lunar landing; the crew still needs a lunar-orbit landing system for a surface expedition.
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Starship HLS: role, size and development status
NASA’s Human Landing Systems page identifies Starship HLS as the lander being developed to transport astronauts between lunar orbit and the surface for Artemis III and Artemis IV. NASA describes the lander as approximately 165 feet (50 meters) tall. That dimension refers to the HLS vehicle described for the lunar mission, not a promise that every Starship variant or test vehicle has identical dimensions.
The decisive status qualification is NASA’s requirement for an uncrewed demonstration before crew use. Until that demonstration and the associated certification work are complete, Starship HLS should be described as a system under development rather than an operational lunar transport service.
Official material available for this comparison does not provide a complete, current, like-for-like Starship launch payload to TLI, lunar-orbit payload or surface-delivery payload. Starship is often discussed as a family of vehicles with different configurations and mission assumptions, but a number quoted for one configuration cannot be silently transferred to the HLS mission. The responsible comparison is therefore qualitative unless NASA or the program publishes a matched figure.
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“Bigger” can refer to height, liftoff mass, thrust, payload or the scale of the mission architecture. The available figures answer only some of those questions. NASA gives SLS’s initial and Block 1B thrust as approximately 8.8 million pounds and publishes its TLI payload ranges. NASA gives Starship HLS’s approximate height as 165 feet (50 meters), but the cited material does not establish a current, directly comparable HLS liftoff mass or lunar payload.
Consequently, a simple headline such as “Starship is bigger” or “SLS carries more” hides the metric being used. Starship HLS may be physically taller in the configuration NASA describes, while SLS has a clearly specified single-launch crew-and-cargo-to-TLI capability. Neither fact alone determines which system is more capable for every mission.
Payload: Earth orbit, TLI and the lunar surface are different measures
Payload comparisons become confusing when three destinations are mixed:
- LEO payload: mass delivered to a relatively low orbit around Earth. This is a useful measure for assembling or refueling spacecraft but does not show how much can be sent to the Moon.
- TLI payload: mass given enough energy to leave Earth orbit on a lunar trajectory. SLS’s published 27-, 38- and 42-metric-ton figures belong to this category, with the stated crew or cargo qualification.
- Surface payload: mass that survives lunar descent and is delivered to the Moon’s surface. A lander’s engines, landing hardware, ascent propellant and mission reserves consume part of the mass launched toward the Moon.
Because no current official Starship HLS figure in the cited material matches those SLS TLI values on the same basis, there is no defensible answer to “which carries more to the Moon?” without first specifying whether “to the Moon” means TLI, lunar orbit or the surface. SLS has the published TLI numbers; Starship HLS has the planned surface-landing role.
Propulsion and vehicle architecture
SLS’s staged launch system
SLS gets its initial thrust from two five-segment solid boosters and four RS-25 engines burning liquid hydrogen and liquid oxygen in the core stage. The boosters provide high thrust at liftoff, while the liquid engines continue powered ascent after booster separation. An upper stage then completes the energy needed to send Orion and its attached mission hardware toward the Moon.
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The 8.8-million-pound thrust figure describes liftoff thrust, not the force available throughout the entire flight. Rocket mass decreases as propellant is consumed and stages separate, so thrust, acceleration and payload performance change during ascent.
Starship HLS’s development architecture
The HLS vehicle is being developed specifically for the lunar landing segment. Its relevant performance will depend on the finalized lander design, mission reserves, certification and the operational sequence chosen for Artemis. The cited NASA sources establish its role, approximate height and demonstration requirement, but not a final set of flight-proven payload or cadence statistics.
Claims about Starship’s eventual economics or throughput should therefore be labeled as design goals or development expectations. A planned reusable architecture can have a very different long-term cost profile from an expendable launcher, but that potential is not the same as a measured per-flight result.
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Reusability and launch cadence
SLS is an expendable Artemis launch vehicle: the major launch hardware is not recovered for routine reuse after an Artemis flight. Its value proposition is a specified, integrated crew-launch capability rather than rapid reuse.
Starship’s broader design is associated with reusability and a higher-cadence operating model. For the HLS mission, however, those benefits remain subject to development, testing, certification and the actual lunar mission sequence. No operational lunar-flight cadence or flight-proven HLS turnaround time is established by the cited sources.
This distinction matters for both economics and planning. A reusable system could eventually distribute development and hardware costs across more flights, while a low-cadence expendable system concentrates cost in each mission. Until Starship HLS completes the required demonstrations, that is a comparison of operating models, not a comparison of audited results.
Crew safety and integration
SLS is integrated with Orion as NASA’s crew-launch system. The rocket’s role, payload interface and Artemis crew missions are specified by NASA, so the launcher, spacecraft and ground systems can be certified as one transportation segment.
Starship HLS adds a separate crewed transportation segment after Orion reaches lunar orbit. NASA’s requirement for an uncrewed demonstration recognizes that landing people on the Moon introduces hazards distinct from Earth launch: precision descent, surface operations, ascent and rendezvous or transfer back to the crew spacecraft. The demonstration must precede crew use; a successful Earth launch alone would not establish lunar-lander readiness.
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Integration also affects mission design. SLS, Orion and the lander must agree on interfaces, timelines, communications, navigation, emergency procedures and crew-transfer operations. A rocket can have impressive raw thrust and still be unsuitable for a crewed mission if its spacecraft interfaces or operational sequence are not mature.
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SLS has a defined role in NASA’s Artemis architecture and published Block 1 and Block 1B performance figures. Block 1B is described as the more powerful successor and the primary crew-transport rocket for later Artemis missions.
Starship HLS is earlier in its lunar-service lifecycle. NASA explicitly describes it as under development and requires an uncrewed demonstration before astronauts fly. That means schedule discussions should separate milestones: vehicle development, uncrewed lunar demonstration, certification and first crewed landing. Treating a development target as an operational date can make the two programs appear more comparable than they are.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe architecture also carries program-level dependencies. A delay to SLS or Orion affects Earth departure; a delay to HLS affects the lunar landing segment. Using both systems does not eliminate schedule risk, but it distributes the technical work across specialized vehicles instead of requiring one vehicle to perform every phase.
What the available cost figures do—and do not—say
The U.S. Government Accountability Office reported in its 2024 assessment that NASA established $9.6 billion in December 2023 development cost baselines for SLS Block 1B, Gateway initial capability and Human Landing System initial capability. GAO also reported that those projects plus Orion represented $19.2 billion, nearly 60 percent of the major-project portfolio’s development costs in that assessment.
These are development baselines and portfolio figures. They are not a clean SLS-versus-Starship per-launch price comparison, and they do not provide an operational cost per kilogram to TLI or to the lunar surface. Development spending covers engineering, testing, facilities, integration and other work that cannot be assigned to one flight by simply dividing a total.
A meaningful cost comparison would need the same accounting boundaries for both systems: development versus production, government spending versus commercial payments, launch services versus spacecraft and lander costs, and recurring flight cost versus one-time infrastructure. The cited GAO numbers establish the scale of NASA’s development commitment but do not settle that broader question.
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Is Starship replacing SLS?
Not in the Artemis III and IV architecture described by NASA’s Human Landing Systems material. SLS launches Orion and the crew from Earth; Starship HLS takes over in lunar orbit for the descent and ascent. Replacing SLS would require a different Earth-launch and crew-transport plan, not merely a different lunar lander.
Future architectures can change. NASA could revise launch vehicles, spacecraft, staging or mission sequences as hardware and policy evolve. The accurate present-tense statement is narrower: Starship HLS is being developed as a lunar lander that complements SLS in the cited architecture, while SLS remains NASA’s specified crew launcher for the Earth-to-Moon leg.
Which system is the better choice for a mission?
Choose the SLS capability when the requirement is direct crewed lunar departure
- You need a NASA-specified launcher for Orion and astronauts departing Earth for the Moon.
- You need a published TLI performance basis: more than 27 metric tons for Block 1 crew configuration, approximately 38 metric tons for Block 1B crew configuration or approximately 42 metric tons for Block 1B cargo-only configuration.
- You are evaluating a single-launch Earth-to-Moon delivery architecture rather than a lunar landing vehicle.
Choose the Starship HLS role when the requirement is lunar descent and ascent
- You need a lander to move astronauts from lunar orbit to the surface and back.
- You are planning around the Artemis III or IV HLS role described by NASA.
- You are willing to evaluate a system whose lunar capability, operational cadence and crew certification are still being demonstrated.
Do not use either system as a proxy for the other
- Do not compare SLS TLI payload directly with an unspecified Starship surface payload.
- Do not treat Starship’s intended reusability as a measured lunar-flight cost advantage.
- Do not infer crew readiness from an uncrewed launch or from performance of a Starship configuration that is not the HLS vehicle.
Questions readers often ask
Can SLS land astronauts on the Moon?
No. SLS launches Orion and sends the crew toward the Moon. A separate lunar landing system is required for descent to the surface and ascent back to lunar orbit.
Does Starship HLS launch astronauts from Earth?
Not in the NASA Artemis III and IV arrangement described here. Astronauts launch aboard Orion on SLS and transfer to Starship HLS in lunar orbit.
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What is SLS Block 1B’s lunar payload?
NASA’s 2025 Marshall Space Flight Center figures list approximately 38 metric tons (84,000 pounds) for the crew configuration and approximately 42 metric tons (93,000 pounds) for cargo-only TLI capability.
Why is the cargo-only number higher?
A cargo-only mission does not carry the same crew spacecraft and crew-mission requirements, leaving more of the vehicle’s TLI capability available for cargo.
How tall is Starship HLS?
NASA describes the developing HLS as about 165 feet (50 meters) tall.
Is Starship HLS operational?
No. NASA describes it as under development and requires an uncrewed demonstration before crew use.
Which rocket is reusable?
SLS is designed for expendable Artemis flights. Reusability is a central design objective associated with Starship, but the cited sources do not establish a flight-proven reusable lunar-service record or recurring HLS price.
Which launch costs less?
The available figures do not answer that question. GAO’s $9.6 billion and $19.2 billion figures are development baselines and portfolio totals, not comparable per-launch prices.
What to remember
SLS and Starship HLS solve different parts of the lunar transportation problem. SLS offers NASA a currently specified single-launch Earth-to-Moon crew-and-cargo architecture with published TLI performance. Starship HLS is intended to provide the lunar-orbit-to-surface-and-back leg and could eventually offer a more reusable, higher-throughput operating model, but its relevant lunar capabilities remain subject to demonstration and certification. The fairest comparison is therefore architectural: SLS is the Earth departure system, while Starship HLS is the developing lunar lander that works with it.
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