SMRTR Science & EngineeringFeb 4, 2026Ars Technica

NASA finally acknowledges the elephant in the room with the SLS rocket

SMRTR summary

NASA's Space Launch System rocket continues to face hydrogen leak problems that plagued its first launch three years ago, forcing delays to the Artemis II moon mission from February to March after a failed fueling test. The $30 billion program suffers from an extremely low flight rate, with only one successful launch since 2022, making each mission experimental rather than operational. NASA Administrator Jared Isaacman acknowledged this critical flaw, admitting the rocket has "the lowest flight rate of any NASA-designed vehicle," while officials concede every launch will remain experimental due to the system's complexity and cost.

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