WGU Astronomy

Front

What was at the center of the circles in Ptolemy's model of planetary motion?

Back

The Earth

Front

What is a key distinction between Kepler’s model of the universe compared to previous models?

Back

Kepler was the first to propose that orbits are not perfect circles.

Front

Which scientist is credited with developing the mathematical framework to accurately describe the force of gravity and the way forces behave in our universe?

Back

Issac Newton

Front

Which scientist utilized precision mathematics to develop planetary laws of motion?

Back

Kepler

Front

Which scientist was unable to identify a parallax in his measurements of stellar positions and so was unable to support a heliocentric model for the Solar System? Options: Tycho Brahe, Galileo Galilei, Johannes Kepler, Isaac Newton

Back

Tycho Brahe

Front

What did Ptolemy use to explain retrograde motion in his model?

Back

Epicycles and deferent

Front

What is one observation Galileo made that was used to support the heliocentric theory?

Back

Phases of Venus

Front

Which statement in Kepler’s first law proves planetary motion as a heliocentric model?

Back

Planetary motion shows elliptical orbits.

Front

Object A orbits the Sun every 64.0 years. Object B is 125.0 AU from the Sun. Which is closer to the Sun?

Back

Object A is closer to the Sun than Object B.

Front

Which comet broke up and bombarded Jupiter in 1994?

Back

Shoemaker-Levy 9