Eclipses generally occur in pairs, with a solar eclipse about ________ before or after a lunar eclipse.
A. 2 months
B. a day
C. a month
D. a week
E. 2 weeks
Answer: E
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Knowing a cluster's turn-off mass tells you the cluster's ________
Fill in the blank(s) with correct word
About 1 ?s after the Big Bang, the temperature of the universe was about 1013 K. What energy (in eV) does this correspond to?
A) 1 neV B) 1 keV C) 1 MeV D) 1 GeV E) 1 TeV
The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus
a. True b. False Indicate whether the statement is true or false
Aluminum has a positive coefficient of thermal expansion. Consider a round hole that has been drilled in a large sheet of aluminum. As the temperature increases and the surrounding metal expands, the hole diameter will
A) increase. B) decrease. C) remain constant. D) depends how much metal surrounds the hole