Which of the following best sums up current scientific thinking about the nature of dark energy?
A) Dark energy most likely consists of a form of photons that we can't see or detect.
B) Dark energy is most likely made up of weakly interacting particles that do not interact with light.
C) Dark energy probably exists, but we have little (if any) idea what it is.
D) Dark energy is the source of the mind weapon used by Sith Lords in Star Wars.
C) Dark energy probably exists, but we have little (if any) idea what it is.
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The Local Group is a _____
A) rich galaxy cluster B) poor galaxy cluster C) regular galaxy cluster D) spherical galaxy cluster
A 200-kg spacecraft is launched to the Moon. After it has landed on the Moon, its weight is ________.
A. zero B. 200 kg C. about 1/6 its weight on Earth D. The answer depends on which side of the Moon the spacecraft landed on.
A fluid has a density of 1 040 kg/m3 . If it rises to a height of 1.60 cm in a 1.50-mm diameter capillary tube, what is the surface tension of the liquid? Assume a contact angle of zero
a. 0.0612 N/m b. 0.122 N/m c. 6.12 N/m d. 0.245 N/m e. 12.2 N/m
While Earth is experiencing a total solar eclipse, an observer on the side of the Moon facing Earth would see
A) Earth disappear from the sky. B) Earth dim and turn reddish. C) nothing unusual. D) a dark area moving across the face of Earth.