Earth Science - Chapter 22 Origin of Modern Astronomy

Front

Who discovered that Venus has phases, just like the moon?

Back

Galileo

Front

What does the geocentric model of the universe state?

Back

Earth was the center of the universe.

Front

According to the third law of planetary motion, what is the period of revolution of a planet related to?

Back

The planet's distance to the sun.

Front

Which of the following was NOT discovered by Galileo?

Back

The two moons of Mars.

Front

What does the second law of planetary motion state?

Back

Each planet revolves so that an imaginary line connecting it to the sun sweeps over equal areas in equal time intervals.

Front

What is the first law of planetary motion?

Back

A planet's orbit around the sun is an ellipse, with the sun at one focus.

Front

What is the law of universal gravitation?

Back

Every point mass attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

Who proposed the heliocentric model of the universe?

Back

Copernicus.

Front

What are sunspots?

Back

Dark spots on the sun's surface caused by magnetic activity.

Front

What did Galileo use to observe celestial bodies?

Back

A telescope.