Question

1. The author mentions in one place that the Moon is approximately 60 Earth radii away. In another place he says the Moon is about 10 times the Earth's girth away (in this case, girth really means "how far around") Without looking up the numbers for the Earth's size or the real distance to the Moon, show that these two statements are roughly consistent with each other. Describe why this is true.

2. Why are the planets close to the Sun in our solar system small and dense and rocky, but the planets further out large and gassy/icy with many moons? What is the origin of all the billions of small asteroids and comets?

Answer 1

this is the answer of that question.