When Apollo 9 in March 1969 human spaceflight, it was the second crewed mission and the countdown to Apollo 11.
Read more here:: http://www.nasa.gov/image-feature/apollo-9-takes-the-lunar-module-for-a-test-drive
When Apollo 9 in March 1969 human spaceflight, it was the second crewed mission and the countdown to Apollo 11.
Read more here:: http://www.nasa.gov/image-feature/apollo-9-takes-the-lunar-module-for-a-test-drive