In Order to Measure the Speed of the Sun with Respect

question 297

Multiple Choice

In order to measure the speed of the Sun with respect to the center of the galaxy,it was necessary to establish a rest frame.What was used to establish this frame?

• A) the average of several nearby galaxies
• B) the globular clusters in the halo because they remain at rest while the galaxy rotates beneath
• C) the globular clusters in the halo because their velocities must average to zero
• D) the Great Attractor because its enormous mass acts like a stationary point

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