S6E1.C Inner vs Outer Planets

Front

Solar System

Back

The collection of planets and their moons, along with other celestial bodies (space stuff), that orbit the sun. Also a similar system orbiting a different star.

Front

Ellipse

Back

An ellipse looks like a circle with two longer, flatter sides.

Front

Gravity

Back

The force in our universe that pulls objects towards each other.

Front

Inertia

Back

A property of matter by which an object will stay still or stay moving in a straight line if it is already doing so unless the object is acted upon by an outside force.

Front

Atmosphere

Back

The layer of gases that surrounds a planet.

Front

Orbit

Back

The circular path something follows as it travels around something else.

Front

Gaseous Planet

Back

A big planet made mostly of gases instead of rock; also called a 'gas giant.'

Front

Terrestrial Planet

Back

A small, rocky planet with a solid surface, like Earth or Mars.

Front

Axis

Back

The invisible, imaginary line a planet spins around, like a pole through the top and bottom.

Front

Rotation

Back

When a planet spins around on its axis; responsible for day and night.