AST 1 & 2 (Scale Size & Solar System)

Front

Astronomical Unit (AU)

Back

The average distance between Earth and the sun.

Front

Light Year (LY)

Back

The distance that light travels in 1 year.

Front

Heliocentric Model

Back

Sun-centered model of the solar system first proposed by Copernicus.

Front

Geocentric Model

Back

Earth-centered model of the Solar System first proposed by Ptolemy.

Front

Dwarf Planet

Back

An object that orbits the sun and is spherical, but has not cleared the area of its orbit. Examples include Pluto, Ceres, Eris, MakeMake, Haumea.

Front

Ellipse

Back

Oval shape of planetary orbits.

Front

Orbit

Back

The path of an object as it revolves around a point in space.

Front

Gas Giant

Back

Large planet mostly made of gas.

Front

Terrestrial Planet

Back

A planet with a rocky surface.

Front

Axis

Back

An imaginary line about which an object rotates.