What prevents stars greater than about 100 times the Sun's mass from existing?
A. The gravitational attraction would overcome the rate of thermal expansion leading to a black hole.
B. The gaseous material of the universe is too widely dispersed to allow for the formation of stars of this mass.
C. Fusion cannot take place at these higher mass levels.
D. The rate of thermal expansion would overcome gravitational attraction leading to explosion.
Answer: D
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The average salinity of the oceans is about 3.5% (or 35 parts-per-thousand)
Indicate whether the statement is true or false
Deposits made directly by a glacier consist of
a. clay. d. silt. b. well-sorted sediment. e. poorly sorted sediments. c. sand.
Which of the following has long been characterized as having a laissez-faire economy?
A) Japan B) North Korea C) Taiwan D) South Korea E) Hong Kong
About half the native animals of Australia are __________, which raise their young in pouches.
A. birds B. reptiles C. rabbits D. marsupials