| Once in space, astronauts must adapt to microgravity, a nearly weightless environment. |
| We see the other astronauts, already out for the count, in their sealed sleep bubbles. |
| Someday solar sails might be used to send astronauts to new worlds around other stars. |
| The Lunar module itself, carrying four astronauts, will settle on the surface of the Moon much like the old Apollo landers. |
| Each one was part of a lunar landing mission during which two American astronauts landed a spacecraft on the surface of the Moon. |
| We can picture exactly what he meant because we have now seen film of astronauts orbiting the Earth in spacecraft. |
