HOUSTON – NASA faces challenging cost, sustainability and utilization issues as it strives to extend operations of the six-person International Space Station from 2020 to 2024, an Inspector General’s audit says. The audit foresees higher-than-projected annual operating expenses, a decline in solar power aggravated by a gap in the ability to launch large critical spare parts, and troubles with ranking research and encouraging outside experiments. The space agency concurred with ...

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