For nearly three decades he has created mesmerizing planetarium shows at the American Museum of Natural History. But other galaxies await.

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The president could tighten federal oversight of the tech titan’s businesses, even if heavy reliance by the Pentagon and NASA on them makes terminating Mr. Musk’s contracts less feasible.

© Joe Skipper/Reuters

President Trump’s decision to pull a close associate of Elon Musk’s out of the running to lead NASA helped doom an extraordinary partnership.

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His career took flight with a newspaper ad in Ottawa, where he would later help steer the country under Justin Trudeau.

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Research breakthroughs are often sagas of passion, curiosity and sacrifice. If Trump’s proposed budget cuts for 2026 are enacted, many such journeys may never get started.

© Caitlin O'Hara for The New York Times