<ul><li>Jared Isaacman, tech-billionaire astronaut leading SpaceX's Polaris missions, says the future of the program is uncertain after being nominated as NASA Administrator.</li><li>Isaacman conducted the world's first commercial spacewalk and was scheduled to fly two more missions, including the first human flight aboard SpaceX's Starship.</li><li>Experts doubt Isaacman will fly during his NASA term due to job demands and safety risks.</li><li>The US Senate needs to confirm Isaacman's nomination before he can assume office.</li></ul>

SpaceX's tech-billionaire astronaut, Jared Isaacman, says his future missions are a 'question mark' now

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