Front

The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon

Back

Lunar Eclipse

Front

The shape of the directly sunlit portion of the Moon as viewed from Earth

Back

Lunar Phases

Front

Caused by the tilt of Earth on its axis as it revolves around the Sun

Back

Seasons

Front

An invisible force of attraction that pulls objects toward each other.

Back

Gravity

Front

The star at the center of our solar system

Back

Sun

Front

A push or pull exerted on an object

Back

Force

Front

The amount of matter in an object

Back

Mass

Front

Motion that results from the combination of the object's forward inertia and the downward pull of gravity on the object

Back

Orbital Motion

Front

An object's tendency to resist a change in motion (an object in motion stays in motion, an object at rest stays at rest)

Back

Inertia

Front

Observable facts; subjects of scientific investigation

Back

Phenomena