History of Astronomy

In the model proposed by Nicolaus Copernicus', which object was at the center of the universe?

• Sun
• Earth
• Milky Way galaxy
• Mars

Ancient Greeks believed, the earth to be the center of the universe. What do we call this model?

• Geocentric universe
• Heliocentric universe
• Copernican model
• Earthcentric

Geocentric is...

• an Earth centered solar system model
• a sun centered solar system model
• a solar system model with no center
• a solar system that has the moon as its center

This keeps objects in orbit

• gravity
• magnetism
• wavelengths
• Cosmic Microwave background Radiation

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

The place where a planet is closest to the Sun as it orbits the Sun is called the

• perihelion
• aphelion

The place where a planet is farthest away from the Sun in its orbit around the Sun is called the

• aphelion
• perihelion

Which astronomer created the 3 planetary laws of motion. 

• Copernicus
• Kepler
• Newton
• Galileo

The spinning of an object on its axis is called______

• orbit
• rotation
• revolution
• tide

A(n) ____ was used by some astronomers to explain retrograde motion.

• Retrograde ellipse
• epicycle
• ellipse
• eccentricity