- Atmosphere - the gaseous envelope surrounding the earth; the air
- Country - the people of a district, state, or nation
- Diameter - a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
- Elliptical - oval, egg-shaped
- Gif - a set of standards and file format for storage of digital color imagesand short animations
- Gravitational pull - the force of attraction between any two masses
- Harbor - to prouduce
- Milky Way - the galaxy to which our sun belongs
- Orbit - the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun
- Solar System - the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comet’s