Science Vocabulary Semester 2

Front

Gravity

Back

Force by which a planet or other body draws objects toward its center.

Front

Habitable zone

Back

The distance from a star at which liquid water could exist on orbiting planets' surfaces.

Front

Kuiper belt

Back

A region of space located past Neptune.

Front

Meteor

Back

A small piece of matter from outer space that becomes a streak of light when it falls through Earth’s atmosphere and burns up.

Front

Oort cloud

Back

The most distant region of our solar system.

Front

Revolution

Back

One complete trip of a planet around the Sun.

Front

Rotation

Back

The spinning of a planet or moon on its axis.

Front

Average speed

Back

Total distance an object traveled divided by the total time it has traveled.

Front

Displacement

Back

How far an object has moved from its original position; the difference between the final and initial positions.

Front

Motion

Back

An object changes its position.