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NASA/Joel Kowsky Boeing informed its Space Launch System (SLS) team of potential layoffs, a worrying sign that NASA’s Moon rocket may be at risk after massive cost overruns and schedule delays.

Boeing Co. managed to preserve half of the 400 jobs it previously considered eliminating at its moon-rocket program following talks with NASA, potentially pointing to greater certainty over future funding despite concerns over a potential shake-up by Donald Trump.

Elon Musk, founder and CEO of SpaceX, has advocated for a Mars-first strategy and has previously called planned missions to the Moon a “distraction."