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Forum: Exploration: Moon to Mars
Topic: NASA's Artemis II mission (Orion/SLS)

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Message to Edit: HTML is ON UBB Code is ON Smilies Legend	Originally posted by Robert Pearlman on 04-01-2026 12:07 PM NASA release <blockquote><font size="+0">[b]All SLS cryogenic tanks in replenish mode[/b]</font> NASA teams have transitioned all cryogenic tanks on the SLS (Space Launch System) rocket to replenish mode. This includes both liquid hydrogen and liquid oxygen tanks for the core stage and the interim cryogenic propulsion stage. Cryogenic propellants naturally warm and evaporate over time, even in insulated tanks. Replenish counteracts this by continuously adding small amounts of liquid hydrogen and liquid oxygen to maintain proper levels and pressure. This ensures the rocket remains fully fueled and stable as the countdown progresses toward terminal count. Following all stages replenish, teams will perform final system checks and verify valve and sensor performance before transitioning to the terminal countdown sequence, which includes simulated launch operations and final readiness verifications.</blockquote>
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