Which of the following statements about lunar phases is true?
A) It is possible to have two full moons during November, but not during December.
B) The full moon sometimes rises around midnight.
C) The time between new moons is two weeks.
D) The time from one new moon to the next new moon is the same as the time from first-quarter moon to third-quarter moon.
E) It is possible to have two full moons during January, but not during February.
Question 2
In stars, helium can sometimes be fused into carbon and heavier elements (in their final stages of life). Why didn't the same fusion processes produce carbon and heavier elements in the early universe?
A) By the time stable helium nuclei had formed, the temperature and density had already dropped too low for helium fusion to occur.
B) Temperatures in the early universe were never above the roughly 100 million Kelvin required for helium fusion.
C) Helium fusion occurred, but the carbon nuclei that were made were later destroyed by the intense radiation in the early universe.
D) No one knowsthis is one of the major mysteries in astronomy.
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