Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the simple question posed by Olbers' paradox?
A) Why is the sky dark at night?
B) What would it be like to ride on a beam of light?
C) How does the Sun produce energy?
D) Can we measure the position and momentum of an electron at the same time?
E) How many stars are in the universe?
Question 2
Which of the following can act like a long-term thermostat for the Earth's average temperature?
A) heat stored in the Earth's magnetosphere
B) the carbon dioxide cycle
C) radioactive elements trapped in the Earth's mantle
D) heat stored in the Earth's liquid core
Examples of visual fields of simple cortical cells.
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