Bill Nelson has stepped down as NASA’s administrator, marking a significant leadership transition under President Donald Trump. Janet Petro, former director of Kennedy Space Center, takes over as interim chief. Nelson, who served for 53 years in public office and was the first sitting U.S. Congressman to fly in space, expressed gratitude in his farewell message. Under Petro, NASA aims to advance its Artemis program, strengthen international partnerships, enhance commercial spaceflight, and focus on research and development for future Mars exploration. This change is seen as a pivotal moment for NASA as it prepares for ambitious future missions.