In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because
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dust injected into the stratosphere from the impact absorbed visible light from the Sun, causing global temperatures to plummet.
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In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct
b. FALSE; Ptolemy put the Sun at the center.
c. FALSE; The planet stays on the deferent circle.
d. FALSE; The Earth is at the center of the epicycle.
e. FALSE; Both c and d are correct.
When studying the angle of incidence in the refraction process, how must this angle be measured?
In the light curve of a nova, the rise to maximum luminosity takes only a few ________
Fill in the blank(s) with correct word
What are two differences observed between Type I and Type II supernovae?
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