Astronomy Unit 1 Test F25

Front

Newton's Law of Universal Gravitation

Back

States that the force between two objects increases with mass.

Front

Contribution of Newton to Astronomy

Back

Developed a theory of gravity that could explain orbital motion.

Front

Reflecting Telescopes

Back

Telescopes that use mirrors to collect and focus visible light.

Front

Geocentric Model Explanation for Day & Night

Back

The Sun orbited Earth.

Front

Flaw in Copernicus' Heliocentric Model

Back

Assumed planets moved in circles.

Front

Definition of Heliocentric Model

Back

A model of the solar system where the Sun is at the center.

Front

Definition of Geocentric Model

Back

A model of the solar system where Earth is at the center.

Front

Elliptical Orbits

Back

The shape of the orbits of planets as described by Kepler's laws.

Front

Kepler's First Law

Back

Planets move in elliptical orbits with the Sun at one focus.

Front

Definition of Gravity

Back

A force that attracts two bodies towards each other, proportional to their masses.