Author Question: What does Hubble's law imply about the history of the universe? A) The universe must be ... (Read 61 times)

Zoey63294 · **on:** Jul 27, 2018

What does Hubble's law imply about the history of the universe?

A) The universe must be infinitely old and huge.
B) The universe had a beginning and has expanded since, giving it a finite age.
C) The Milky Way lies exactly at the center of this expansion.
D) The redshifts will lengthen with time due to dark energy.
E) The redshifts will turn to blue shifts as universe contraction follows the expansion.

Question 2

Describe the consequences of orbital resonances between the moons of Saturn and the particles that make up that planet's ring system.

What will be an ideal response?

ergserg · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

B

Answer to Question 2

Particles that would have orbital periods which are integral fractions of lunar orbits are constantly pulled out of these orbits and into elliptical orbits. Through particle collisions, these orbits become circular again. Thus orbital resonances are effective in moving ring particles out of certain orbits and into others.