The "light travel time distance" measures
A. the amount of time the sunlight takes to reach Earth.
B. the distance light travels in one year.
C. how far the light from a galaxy would have traveled if the Universe was not expanding.
D. All of these choices are correct.
Answer: C
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A lunar eclipse occurs when the
A) Sun passes into Earth's shadow. B) Moon passes into Earth's shadow. C) Earth passes into the Sun's shadow. D) Earth passes into the Moon's shadow.
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What will be an ideal response?
The Cenozoic era began about how many million years ago?
a. 65 b. 545 c. 3 d. 245
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.