Vocabulary Quiz #1

counterclockwise

The earth rotates in this direction

Kepler's Third Law of Planetary Motion

The farther away a planet is from the sun, the longer it takes to orbit the sun.

Newton's Law of Universal Gravitation

The force of gravity depends on the masses of the objects and the distance between them

23.5 degrees

The tilt of the Earth's axis

Revolution

one complete trip along an orbit

Ellipse

planets orbit the sun in an elongated, circular path

Orbit

the path that a body follows around another body in space

Axial Tilt

the reason the Earth experiences changing seasons.

Rotation

the spin of a body on its axis

Equinox

the time when the sun is directly above the equator

Equator

0 degrees latitude - Does not experience changing seasons

Kepler's First Law of Planetary Motion

Planets orbit the sun in an elongated circular path called an ellipse.

Kepler's Second Law of Planetary Motion

Planets seem to move faster when they are closer to the sun, and slower the farther away they are.

Axis

imaginary line connecting North and South Pole (the Earth rotates on its axis in a counter-clockwise direction)