What model of the solar system did Ptolemy describe in his work the Almagest?
What mathematical device did Ptolemy use to explain the apparent backward motion of planets?
Hint: These were circles within circles to account for retrograde motion.
Who published 'On the Revolutions of the Celestial Spheres' in 1543, proposing the heliocentric model?
What did Copernicus place at the center of his model of the solar system?
What was Galileo the first to use for astronomical observation in 1609?
What did Galileo discover about Jupiter that supported the heliocentric model?
What type of solar system model did Tycho Brahe propose?
Hint: It was a compromise between Ptolemy and Copernicus.
Tycho Brahe is best known for collecting extremely accurate data on what?
What did Galileo observe on the surface of the Moon that challenged the idea of perfect celestial spheres?
What observation did Galileo make about Venus that supported the Copernican model?