Author Question: What do we mean when we say that the Sun is in gravitational equilibrium? A) The Sun always has ... (Read 39 times)

big1devin · **on:** Jul 27, 2018

What do we mean when we say that the Sun is in gravitational equilibrium?

A) The Sun always has the same amount of mass, creating the same gravitational force.
B) The Sun maintains a steady temperature.
C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward.
D) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity.

Question 2

Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?

A) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center.
B) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster.
C) Dark matter is present between galaxies in clusters, but not within individual galaxies.
D) Dark matter is the dominant form of mass in both clusters and in individual galaxies.