| Term | Definition |
| astronauts | pilots or members of the crew of a spacecraft |
| capsule | the enclosed front section of a rocket made to carry instruments, astronaunts into space |
| hatch | a trapdoor covering an opening in an aircraft's or ship's deck |
| horizon | line where the Earth and sky seem to meet; skyline |
| lunar | of, like, or about the moon |
| module | a self-contained unit or system within a larger system |
| quarantine | detention, isolation, and other measures taken to prevent the spread of an infectious disease |
| impact | action of striking one thing against another; collision |
| sphere | ball or globe |
| transmission | passage of electronic waves from a transmitter to a receiver |