Author Question: According to current understanding, which of the following is required in order for a planet to have ... (Read 39 times)

brutforce · **on:** Jul 27, 2018

According to current understanding, which of the following is required in order for a planet to have rings?

A) The planet must orbit its star at a distance greater than Mars orbits the Sun.
B) The planet must have many small moons that orbit relatively close to the planet in its equatorial plane.
C) The planet must once have had a large moon that came too close to it, shattering the moon and creating the ring particles.
D) The planet must be at least as massive as Saturn.

Question 2

A star is observed with a surface temperature of 3,000 K and a luminosity of 105 solar. What is the approximate radius of this star?

A) 30 Msun B) 0.3 Msun
C) 3 Msun D) The radius cannot be determined.