Author Question: In a ten-billion to one scale model, the Sun and the Earth are about the size of A) a grapefruit ... (Read 53 times)

NguyenJ · **on:** Jul 27, 2018

In a ten-billion to one scale model, the Sun and the Earth are about the size of

A) a grapefruit and a grape. B) a grape and a grain of sand.
C) a grapefruit and a grain of sand. D) a basketball and a grape.

Question 2

How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?

A) A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits.
B) When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit.
C) When migrating planets collide, they would move onto more eccentric orbits.
D) When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.