Unit 7 Lesson 4 Vocabulary Set 2

Front

A force of attraction between objects that is due to their masses and the distances between them.

Back

Gravity

Front

The path that a body follows as it travels around another body in space.

Back

Orbit

Front

Polish astronomer who discovered the motions of the planets could best be explained if they orbited the sun.

Back

Nicolaus Copernicus

Front

A scientist who discovered the laws of planetary motion.

Back

Johannes Kepler

Front

A point in an orbit where an object is farthest from the sun.

Back

Aphelion

Front

A point in an orbit where an object is closest to the sun.

Back

Perihelion

Front

Each planet orbits the sun in an ellipse with the sun at one focus.

Back

Kepler’s 1st law

Front

As a planet moves around its orbit, it sweeps out equal areas in equal times.

Back

Kepler’s 2nd law

Front

The square of the orbital period is proportional to the cube of the planet's average distance from the sun.

Back

Kepler’s 3rd Law

Front

States that all objects in the universe attract each other through gravitational force.

Back

Law of Universal Gravitation