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What does the geocentric model of the universe place at the center?

• The Sun
• The Earth
• The Moon
• The Milky Way

Who proposed the first heliocentric model?

• Copernicus
• Aristarchus
• Ptolemy
• Aristotle

What model describes the Earth as a flat, thin, circular disk floating on a vast sea?

• Thales of Miletus' model
• Anaximander's model
• Pythagorean model
• Plato's model

What phenomenon supports the idea that the Earth is spherical due to the circular shadow it casts?

• Partial lunar eclipse
• Sinking ships
• NCP and SCP constellations
• Retrograde motion

What did Pythagoras use to support his theory of a spherical Earth?

• The motion of the sun
• Sinking ships
• Tides of the sea
• Phases of Venus

According to Aristotle, how many spheres make up his model of the universe?

• 45
• 50
• 56
• 60

What concept did Ptolemy introduce to account for the apparent irregular paths of planets?

• Heliocentrism
• Epicycles
• Deferent
• Equant

What did Galileo discover that challenged the geocentric model?

• Saturn's rings
• Phases of Venus
• Neptune
• Black holes

What phenomenon occurs when an object moves in the direction opposite to the rotation of its primary?

• Prograde motion
• Retrograde motion
• Circular motion
• Epicycle motion

Which model combines elements of both geocentrism and heliocentrism?

• Copernican model
• Aristotelian model
• Tycho Brahe's model
• Pythagorean model