Quiz Chapter 23

The ______ theory states that the earth is the center of the universe.

Who was the first scientist that suggested that the sun was the center of the solar system.

• Nicolas Copernicus

• Galileo Galilei

• Johannes Kepler

• Isaac Newton

Which scientist discover that gravity holds the planets in their orbits?

• Galileo Galilei

• Isaac Newton

• Tycho Brahe

• Johannes Kepler

Write the name of our galaxy:

Select the classification of planets according to their PROPERTIES

• terrestrial

• inferior

• jovian

• superior

Select the number of planets in the solar system

• 7

• 8

• 9

• 6

True of False

A planet does not share the space of its orbit with any other object of significance size, other than moons.

Write the name of a dwarf planet

Select the closest planet to the sun

• mercury

• venus

• earth

• mars

This planet is often called red planet

• mercury

• venus

• earth

• mars