What is the mass of the supermassive black hole in the center of the Andromeda galaxy?
A. 10 times the mass of our Sun.
B. 5000 billion times the mass of our Sun
C. 400 billion times the mass of our Sun
D. 30 million times the mass of our Sun
E. 20 thousand times the mass of our Sun.
Answer: D. 30 million times the mass of our Sun
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The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star is not rotating. B) This is an example of the photoelectric effect. C) This is an example of the Doppler effect. D) The star has a radial velocity towards us. E) The second law of Kirchhoff explains this.
Give the dimensions and shape of the Galactic disk
What will be an ideal response?
How will high tides differ from their average values when the Moon is in its full phase?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is full.
Suppose we could magically double the mass of the moon, double the mass of Earth, and double the distance between Earth and the moon, all at the same time. How would this affect the force that the moon exerts on Earth?
A) The force would be halved. B) The force would be quadrupled. C) The force would be doubled. D) The force would be unchanged. E) The force would be multiplied by eight.