- Moon: The natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
- Phases: A distinct period or stage in a process of change or forming part of something's development.
- Spaceship: A spacecraft is a vehicle or machine designed to fly in outer space and used to go to the moon.
- Orbit: The path one object takes around another.
- Astronomer: An expert in the study of the Sun, Moon, stars, planet, like our earth
- Astronaut: A person who travels beyond the earth’s atmosphere
- Lunar: Of, involving, caused by, or affecting the moon
- New Moon: The phase of the moon when the moon is lined between the Earth and the Sun; we see the side of the moon that is not being lit by the Sun
- Rotate: To turn around a center point
- Universe: The huge space that contains all matter and energy
- Crescent: When the moon is less than half lit up
- Gibbous: When the moon is more than half lit up
- Resources: http://idahoptv.org/sciencetrek/topics/moon/glossary.cfm