astronauts

pilots or members of the crew of a spacecraft

capsule

the enclosed front section of a rocket made to carry instruments, astronaughts, etc., into space. In flight, the capsule can separate from the rest of the rocket and go into orbit or be directed back to earth.

hatch

trapdoor covering and opening in an aircraft's or ship's deck

horizon

line where the Earth and sky seem to meet; skyline. You can't see beyond the horizon.

lunar

of, like, or about the moon

module

self-contained unit or system within a large system, often designed for a particular function

quarantine

detention, isolation, and other measures taken to prevent the spread of an infectious disease