8. Centripetal Forces & Gravitation

Which of the following best explains the apparent retrograde motion of planets as observed from $Earth$?

Why do we always see the same side of the $\mathrm{Moon}$ facing the $\mathrm{Earth}$?

How does Hubble's law of universal expansion ($v=Hd$) provide evidence to support the Big Bang theory?

Which of the following best explains why there is one winter and one summer each year on $Earth$?

Which of the following statements about Kepler's laws is false?

How did Kepler's first law of planetary motion alter the Copernican system?

Which of the following best describes Earth's orbit according to Kepler's laws?

What is the chief difficulty in attempting to detect planets around other stars?

According to Kepler's First Law, why do planets travel in elliptical orbits around the $Sun$?

Which of the following phenomena is explained by Kepler's laws of planetary motion?

Which of the following best explains why solar and lunar eclipses occur, according to the principles of orbital motion described by $Kepler’s$ Laws?

Newton showed that Kepler’s laws are $\dots$.

Which of the following best explains why the has phases as seen from $Earth$?

According to Kepler's Laws, which of the following types of objects in the solar system typically have the most eccentric orbits?

Which of Kepler's laws is most directly related to the observation that as the Earth rotates through $24$ hours, the apparent position of the Sun changes in the sky, and how does this relate to Earth's motion around the Sun?