If the Galaxy were spinning like a solid disk,stars farther out from the center would
A) have higher speeds than those near the center.
B) have lower speeds than those near the center.
C) have the same speeds as those near the center.
D) eventually fly apart from the immense speed.

Question

Quizplus · Accepted Answer

In a spinning solid disk, objects farther from the center have to travel a greater distance to complete a rotation in the same amount of time as objects closer to the center. Therefore, they have to be moving faster. This is known as Kepler's Law of Planetary Motion, which applies to rotating objects in general.

If the Galaxy Were Spinning Like a Solid Disk,stars Farther