Lesson Outline continued D. Human Spaceflight 1. One goal of the early space program was to send us space. 2. Space travel is dangerous because exposure to could damage health. 4. Project Date 3. The first crewed space missions occurred when astronauts orbited earth in the early 1960s. was a series of space missions designed to send astronauts to the Moon and 5. Rockets that were used to launch spacecraft could be used only once, so NASA designed reusable spacecraft called space shuttle to transport people and materials to and from space. 6. People from many countries are building the ISS Earth-orbiting research laboratory where astronauts work and live. F. Space Technology on Earth​