NASA Space Launch System

NASA Space Launch System
Name	Space Launch System
Caption	The SLS Block 1 configuration on Launch Complex 39B for the Artemis 1 mission.
Function	Super heavy-lift launch vehicle
Manufacturer	NASA (lead), Boeing, Northrop Grumman, United Launch Alliance, Aerojet Rocketdyne
Country-origin	United States
Height	322, ft, m (Block 1)
Diameter	27.6, ft, m (core stage)
Mass	5.75, e6, lb, kg (Block 1)
Stages	2 (Block 1)

NASA Space Launch System. The Space Launch System is a super heavy-lift launch vehicle developed by NASA to enable human exploration beyond low Earth orbit. Designed as the primary launch vehicle for the Artemis program, it is intended to carry the Orion spacecraft and other critical payloads to the Moon and eventually to Mars. The rocket represents a cornerstone of American deep space exploration efforts, leveraging heritage technology from the Space Shuttle program and the now-cancelled Constellation program.

Overview

The vehicle is managed by NASA's Marshall Space Flight Center in Huntsville, Alabama, with major contracts awarded to aerospace industry leaders. Its development was mandated by the NASA Authorization Act of 2010, which directed the agency to create a capability for crewed missions to deep space destinations. The rocket's initial configuration, known as Block 1, successfully launched the uncrewed Artemis 1 mission from Kennedy Space Center in November 2022, marking a critical milestone for the program. Subsequent variants, including Block 1B and Block 2, are planned to offer increased payload capacity for more ambitious missions.

Development

The genesis of the program can be traced to the retirement of the Space Shuttle fleet and the subsequent policy shifts during the Obama Administration. Following the cancellation of the Constellation program, the U.S. Congress directed NASA to develop a new heavy-lift vehicle using existing Space Shuttle and Constellation components. Key development milestones included the completion of the Core Stage at NASA's Michoud Assembly Facility in New Orleans and rigorous testing of the RS-25 engines at Stennis Space Center. The program has faced scrutiny over schedule delays and cost overruns, with oversight from the NASA Office of Inspector General and the Government Accountability Office.

Design and specifications

The design utilizes a central core stage powered by four modified RS-25 engines, previously used on the Space Shuttle, flanked by two five-segment solid rocket boosters derived from the Shuttle's boosters. The upper stage for Block 1 is the Interim Cryogenic Propulsion Stage, based on the Delta Cryogenic Second Stage used on the Delta IV rocket. The Block 1B configuration will introduce the more powerful Exploration Upper Stage, manufactured by Boeing. The vehicle's Launch Abort System is designed to protect the crew of the Orion spacecraft in an emergency, similar to systems used on the Apollo program and Soyuz.

Missions

The primary mission for the launch vehicle is NASA's Artemis program, which aims to return humans to the lunar surface. The inaugural flight, Artemis 1, was an uncrewed test flight that sent the Orion spacecraft on a journey around the Moon. The upcoming Artemis 2 mission will carry a crew of four astronauts on a lunar flyby, while Artemis 3 is planned to land astronauts, including the first woman, near the lunar south pole. Future proposed missions under the Artemis program could support the construction of the Lunar Gateway and deliver elements for a sustained lunar presence.

Comparison with other launch vehicles

In terms of lift capability, the vehicle is often compared to other super heavy-lift rockets, both historical and contemporary. It exceeds the payload capacity of the Saturn V rocket used during the Apollo program in certain configurations. Among modern vehicles, it is a direct contemporary of SpaceX's Starship and the legacy Delta IV Heavy operated by the United Launch Alliance. International comparisons are sometimes drawn with the planned Long March 9 from the China Aerospace Science and Technology Corporation and the retired Energia rocket from the Soviet space program.

Future and proposed upgrades

Planned evolutionary upgrades are designed to increase the rocket's performance and mission flexibility. The Block 1B configuration, with its advanced Exploration Upper Stage, will enable the co-manifesting of large payloads alongside the Orion spacecraft. The envisioned Block 2 variant would feature advanced boosters, potentially using liquid propulsion, to achieve the highest payload targets for missions to Mars. These developments are part of a broader deep space infrastructure that includes the Lunar Gateway and potential missions to near-Earth asteroids, as outlined in NASA's Moon to Mars exploration objectives.

Category:NASA launch vehicles Category:Super heavy-lift launch vehicles Category:Artemis program