NASA Administrator Bill Nelson met with Gwen Shotwell, President and Chief Operating Officer of SpaceX, during Kennedy Center Honors this month. SpaceX is currently the second largest contractor for NASA, and is in the process of developing the spacecraft that will take humans to the moon. Nelson expressed concerns about SpaceX CEO Elon Musk's involvement in the company, as well as his distractions on social media platform Twitter. Shotwell reassured Nelson that he had nothing to worry about. NASA has made significant investments in SpaceX, including awarding the company a $3 billion contract to land astronauts on Mars by 2025, and a $1.5 billion contract for a second moon landing.