Level 1 — Absolute Beginner
NASA is building a new rocket to send astronauts to the Moon. The mission is called Artemis III.
Workers at Kennedy Space Center in Florida just finished a big job. They put all four engines on the rocket's main part, called the core stage.
The engines are called RS-25 engines. They are not brand new. They were used before on the Space Shuttle.
Workers also joined more pieces onto the rocket's two boosters. These boosters help the rocket lift off the ground. This work brings NASA closer to sending astronauts to land on the Moon again.
- rocket
- a vehicle that can travel into space
- astronaut
- a person trained to travel and work in space
- engineer
- a person who designs and builds machines or structures
- engine
- a machine that produces power to move something
- core stage
- the main body of a rocket that holds fuel and engines
- booster
- a rocket part that adds extra power to help lift off
- lift off
- the moment a rocket leaves the ground
- mission
- an important job or task, often involving travel
Level 2 — Elementary
NASA engineers at Kennedy Space Center in Florida have completed installation of all four RS-25 engines on the core stage of the Space Launch System rocket being built for Artemis III, the agency's planned crewed lunar landing mission. The engines, refurbished veterans of the Space Shuttle program, were manufactured by Aerojet Rocketdyne and are identified by their individual serial numbers.
At the same time, crews inside the Vehicle Assembly Building have been stacking additional segments onto the rocket's twin five-segment solid rocket boosters, which provide extra thrust during the first minutes of launch. Completing this work clears the way for the finished core stage to be transferred and mounted between the two boosters on the mobile launcher.
Artemis III will mark the third flight of NASA's SLS and Orion spacecraft architecture, and the first in the program intended to land astronauts on the Moon since the Apollo era. NASA is currently targeting 2027 for the mission, though dates in deep-space programs have shifted before.
Separately, NASA confirmed that Artemis II's Orion capsule will fly a steeper reentry trajectory rather than remanufacturing its heat shield, after inspectors found unexpected erosion on the shield used during the uncrewed Artemis I mission. Officials say the adjusted trajectory addresses the issue without delaying the schedule further.
- refurbish
- to clean and repair something so it can be used again
- serial number
- a unique number used to identify one specific item
- thrust
- the forward force produced by an engine to move a vehicle
- mobile launcher
- a large structure used to move and support a rocket before launch
- architecture (technical)
- the overall design or structure of a system
- crewed
- operated with people on board, as opposed to unmanned
- reentry
- the return of a spacecraft into Earth's atmosphere
- heat shield
- a protective layer that keeps a spacecraft from burning up during reentry
Level 3 — Intermediate
NASA has reached a significant assembly milestone for Artemis III, with engineers at Kennedy Space Center's Vehicle Assembly Building completing installation of all four RS-25 engines onto the mission's Space Launch System core stage. The engines, refurbished units originally flown during the Space Shuttle program and manufactured by Aerojet Rocketdyne, are tracked individually by serial number to preserve their extensive flight and maintenance histories.
In parallel, technicians have continued stacking segments onto the rocket's twin five-segment solid rocket boosters, work that must be completed before the finished core stage can be transferred onto the mobile launcher and positioned between the boosters, the next major physical assembly step ahead of eventual rollout.
Artemis III represents the third flight of the SLS and Orion architecture and the program's first attempt at a crewed lunar landing since the Apollo era, currently targeted for 2027, though NASA's deep-space schedule has slipped repeatedly in the past and officials have been cautious about firm commitments. The mission's complexity, spanning launch, lunar orbit rendezvous, and a crewed descent to the surface, makes it substantially more demanding than the uncrewed Artemis I or the crewed lunar flyby planned for Artemis II.
NASA also disclosed a related engineering decision affecting Artemis II: rather than remanufacturing Orion's heat shield after inspectors identified unexpected erosion following Artemis I, engineers opted to modify the capsule's reentry trajectory to a steeper profile, reducing heating exposure without requiring a costly and time-consuming shield redesign, a workaround officials say preserves the current launch schedule.
- milestone
- an important point of progress in a project
- refurbished unit
- a repaired and reused piece of equipment
- rollout
- the process of moving a rocket from its assembly building to the launch pad
- rendezvous
- a planned meeting, especially between spacecraft
- descent
- the act of moving downward, as toward a planetary surface
- slip (schedule)
- to be delayed from an originally planned date
- erosion (engineering)
- the gradual wearing away of a material's surface
- workaround
- a method for overcoming a problem without addressing its root cause
Level 4 — Advanced
NASA has cleared a consequential assembly milestone in its Artemis III campaign, with technicians at Kennedy Space Center's Vehicle Assembly Building completing installation of all four RS-25 engines onto the Space Launch System's core stage. These engines, refurbished units with flight heritage dating to the Space Shuttle program and manufactured by Aerojet Rocketdyne, are meticulously tracked by individual serial number, a practice that preserves granular maintenance records across decades of intermittent service.
Concurrently, crews have continued stacking segments onto the vehicle's twin five-segment solid rocket boosters, a prerequisite for transferring the completed core stage onto the mobile launcher and positioning it between the boosters, the next consequential physical-integration step preceding eventual rollout to the pad.
Artemis III constitutes the third flight of the SLS/Orion architecture and the program's inaugural attempt at a crewed lunar landing since the Apollo era, nominally targeted for 2027, though NASA officials have been notably circumspect about firm commitments given the deep-space program's history of schedule slippage. The mission's operational complexity, encompassing launch, lunar orbital rendezvous, and a crewed descent to the surface, distinguishes it substantially from the comparatively modest uncrewed Artemis I and the crewed lunar flyby scheduled for Artemis II.
NASA also disclosed a consequential engineering trade-off bearing on Artemis II: rather than undertaking a costly and schedule-jeopardizing remanufacture of Orion's heat shield following the discovery of unanticipated erosion after Artemis I, engineers instead elected to steepen the capsule's reentry trajectory, a workaround that curtails thermal exposure while preserving the program's existing timeline, illustrating the incremental, risk-managed engineering adjustments characteristic of a program still working through its early operational cycles.
- consequential
- having important consequences or effects
- flight heritage
- the history of prior use and proven performance of a piece of hardware
- granular (figurative)
- detailed, down to small individual elements
- prerequisite
- something required beforehand as a necessary condition
- integration (engineering)
- the process of combining separate components into a working whole
- circumspect
- cautious and unwilling to take risks
- curtail
- to reduce or limit something
- incremental
- occurring in small, gradual steps
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