Comets have three main parts: the nucleus, the coma, and the tail.

Copernicus was the man who developed the theory of a sun-centered system.

Edward Braddock was leader of the British forces during the French and Indian War.

The amount of time it takes for the earth to travel around the sun is a solar year, or one revolution.

Just outside of Neptune's orbit is a belt of comets known as the Kuiper Belt.

Meteroids are particles of rock and space debris that are smaller than asteroids. Meteors are those particles while they are in the earth's atmosphere, and meteorites are those particles when they have impacted with the earth's surface.

When the moon and sun line up directly with the earth, the resulting, more extreme tides are called spring tides.

The ability of the atmosphere to retain heat is called the greenhouse effect.

Our country's first Vice President was John Adams, who later became the second President.

Pluto is over 100 times farther away from the sun than Mercury.