I observe a galaxy that is 100 million light years away. Which of the following do I see?
A) the light from the galaxy as it is today, and it is redshifted
B) the light from the galaxy as it was 100 million years ago, and it is redshifted
C) the light from the galaxy as it is today, and it is blueshifted
D) the light from the galaxy as it was 100 million years ago, and it is blueshifted
E) Nothing: the galaxy lies beyond the cosmological horizon.
B
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If an object is located 20 m to the right of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 30 m to the right. C. 25 m to the right. D. 20 m to the right. E. 10 m to the right.
The mass of a galaxy can be determined from its _______________ curve
Fill in the blank(s) with correct word
What kind of galaxy is the Milky Way?
A) an irregular galaxy B) a spiral galaxy C) an elliptical galaxy
Which of the following is not true of Mercury?
A) It has many moons. B) At any given time, about half the planet is colder than Antarctica. C) Its surface is heavily cratered. D) Mercury has essentially no atmosphere.