请将以下文档总结在3句话内： Jennings is an astrophysicist. He worked for NASA for 20 years and was the lead scientist for the Mars Rover project. After retiring, he started a private space exploration company. His goal is to make space travel more accessible to the public.
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Jennings 曾是 NASA 的天体物理学家，担任火星漫游者项目的首席科学家长达20年。退休后，他创立了一家私营太空探索公司。他的目标是让太空旅行对公众更加便捷。
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