NASA's RS-25 engines, developed in the 1970s, are among the most reliable rocket engines despite the high $100 million cost per unit. The inspector general warns that the costs associated with the Space Launch System (SLS) and its engine procurement at $2.5 billion per mission create significant obstacles for sustainable deep space exploration. Furthermore, the potential cancellation of the SLS program, as suggested by the Trump administration in favor of cheaper commercial rockets, raises questions about the future of NASA's Artemis lunar missions and upcoming Mars human missions.
The RS-25 engines, while old, are some of the most reliable US rocket engines, but their high costs threaten NASA's deep space exploration campaign.
NASA is facing staggering costs for RS-25 engines, projected at $100 million each, making robust deep space exploration missions increasingly unsustainable.
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