Author Question: The best explanation for the activity at the center of the galaxy is a(n) ____. a. supercluster ... (Read 23 times)

WhattoUnderstand · **on:** Jul 27, 2018

The best explanation for the activity at the center of the galaxy is a(n) ____.

a. supercluster of O and B stars
b. black hole with a mass several thousand times the Sun's
c. giant atomic hydrogen cloud energized into a single, massive emission nebula
d. black hole with a mass several million times the Sun's
e. exotic object known as a magnetar

Question 2

An object's momentum is equal to its ____.

a. acceleration multiplied by its mass
b. acceleration divided by its weight
c. velocity multiplied by the gravitational constant
d. velocity multiplied by its mass
e. velocity divided by its weight