What is the direction of 
at point Q?
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
F. F
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Rather than being a planet, Pluto is really just a large member of
A) the Kuiper belt. B) an extrasolar planetary system. C) the Oort cloud. D) the moon system around Neptune. E) the asteroid belt.
If light in a spectroscope passed through round holes instead of slits, spectral lines would appear
A) as thicker lines. B) round. C) dimmer.
A 170. pound halfback is tackled by a 245. pound guard. Each, of course, exerts a force on the other. Which of the players exerts the LARGER force on the other?
What will be an ideal response?
It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun
As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the planetary nebula that the Sun will form about 5 billion years from now. B) You are in an accretion disk around a supermassive black hole. C) You are in the universe more than 10100 years in the future. D) You are in the universe during its first 380,000 years. E) You are in the central regions of a quasar.