The sky is blue because
a. of the reflection of the oceans.
b. blue is the color of oxygen gas.
c. blue is the color of nitrogen gas.
d. the blue light in sunlight scatters more than the red light.
e. of clouds.
Answer: d. the blue light in sunlight scatters more than the red light.
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The most prominent theory about spiral arms is called the _____
A) spiral quantum fluctuations B) spiral gravitational collapse C) spiral density wave theory D) spiral radiation theory
To a fair approximation, Early Greeks knew the
A) size of Earth. B) size of the Moon. C) Earth-Moon distance. D) all of the above
Microfossil evidence suggests that life
A) originated when the Earth formed 4.6 billion years ago B) originated about 3.4 billion years ago C) existed 3.85 billion years ago D) existed and was well established by 3.4 to 3.5 billion years ago
If the Sun suddenly became less massive, what would happen to Earth's orbit?
A) Spacetime around the Sun would become flatter, and the Earth, with its current momentum, would exit its orbit around the Sun. B) Spacetime around the Sun would become less flat, and the Earth would go plunging into the Sun. C) The Earth's orbital distance from the Sun would increase correspondingly. D) The Earth's orbital distance from the Sun would decrease correspondingly.