How we figured out that earth revolved around the sun.

What is the average speed at which Earth orbits the Sun?

• 107,000 kilometers an hour

• 150,000 kilometers an hour

• 90,000 kilometers an hour

• 200,000 kilometers an hour

Who developed the geocentric model?

• Nicolaus Copernicus

• Johannes Kepler

• Aristotle and Ptolemy

• Galileo Galilei

What did the geocentric model fail to explain?

• The phases of the Moon

• Why planets sometimes changed brightness

• The existence of galaxies

• The rotation of the Earth

What concept did the geocentric model use to explain planetary motion?

• Heliocentrism

• Gravity

• Epicycles

• Ellipses

Who proposed the heliocentric model?

• Galileo Galilei

• Nicolaus Copernicus

• Ptolemy

• Aristotle

What did Johannes Kepler discover about planetary orbits?

• They are static

• They are perfect spheres

• They are circular

• They are ellipses

Which of Galileo's observations supported the heliocentric model?

• The color of Mars

• The rings of Saturn

• The craters on the Moon

• The phases of Venus

Until what year did the Church ban heliocentric works?

• 1900

• 1758

• 1600

• 1825

What does the current model suggest Earth and the Sun orbit?

• The center of the Milky Way

• A black hole

• The center of mass of the solar system

• Each other

What percentage of the solar system's mass does the Sun hold?

• 90%

• 99.87%

• 50%

• 75%