Discuss the below:
Q1: Venus and Earth are about the same size and mass, yet carbon dioxide is a major constituent of the atmosphere of Venus, while oxygen is much more abundant in the Earth's atmosphere. Explain why the atmospheres are so different.
Q2: Explain why there are two general families of planets, rocky terrestrial and gaseous jovian.
Q3: The first planets discovered since ancient times were Uranus and Neptune. Compare how they were discovered.
Q4: What knowledge do comets and asteroids provide to studies of the origin of the solar system?