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15 Cards in this Set

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Astronomy

The study of the moon, stars, and other objects in space.

Rotation

The spinning motion of a planet on its axis.

Orbit

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

Solstice

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

Axis

An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates.

Revolution

The movement of an object around another object.

Calendar

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

Equinox

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

Force

A push or pull exerted on an object.

Gravity

The attractive force between object; its strength depends on their masses and the distance between them.

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 an object.

Weight

The force of gravity on an object.

Inertia

The tendency of an object to resist 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 a force.