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15 Cards in this Set

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Astronomy

The study of the moon stars or other objects in space.

Axis

The imaginary line that passes through earths center and the north and south poles, about which earth rotates.

Rotation

The spining motion of an planet on its axis

Revolution

The movement of an object around another object

Orbit

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

Calendar

A system of organizing time that defines the beginning, length, and divisions of a year

Solstice

The two days of a year on which the sun reaches its greatest distance north or south.

Equinox

The two days of the year on which neither hemisphere is tilted toward or away from the sun.

Force

A push or a pull exerted on an object

Gravity

The attractive force between objects

Law of Universal Gravitation

The scientific law that states that every object in the universe attracts every other object

Mass

The amount of matter in and object

Weight

The force of gravity on an object

Inertia

The tendency of an object to resist a change in motion

Newton's first law of motion

The scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by force.