Why Was Copernicus' Model Much Simpler Than Ptolemy's

Q45: Galileo found the rotation period of the

Q49: Galileo's discovery of four moons orbiting _

Q51: A planet (or comet)will speed up as

Q58: The hypothesis is that the Earth does

Q59: Explain how the telescopic discoveries of Galileo

Q60: According to Newton's laws, the planets orbit

Q62: Copernicus' Heliocentric theory explains that<br>A) the Sun

Q63: Kepler's third law allows us to find

Q65: When a planet's orbit takes it closest

Q67: What is meant by the astronomical unit?