The momentum of an object remains the same unless an unbalanced force acts on it.
a. true
b. false
Answer: a. true
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To observe a spectroscopic binary, we must be able to see both stars individually
a. True b. False Indicate whether the statement is true or false
Which technology was used by the Event Horizon Telescope project to obtain the first image of a black hole?
A) gravitational wave detection B) adaptive optics C) interferometry D) high-speed time monitoring
According to the argument in the text, the Moon’s average surface temperature (since it has no atmosphere and is the same distance from the sun as the earth) should also be 255 K, or it would be if all points on its surface had the same temperature (and the Moon has the same average reflectance as the earth). But the Moon rotates very slowly relative to the sun (once a month) and has no atmosphere or ocean to redistribute energy differences. How do you think that these facts might affect the Moon’s average temperature?
A. The average should be less than 255 K. B. The average should be more than 255 K. C. The average should be the same: the energy flowing in must still balance the energy flowing out.
A quasar's spectrum is hugely redshifted. What does this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the mass of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides