We are unlikely to find fossil evidence of life from more than 3.5 billion years ago because there is no way life existed before then
Indicate whether the statement is true or false
FALSE
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A spiral (S or SB) galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. upper and lower main sequence stars and gas and dust. e. mostly white dwarfs and supergiants.
Which of the following is most important in causing a cloud of gas to collapse to form a star and planets?
A) Gravity pulls all the gas inward. B) Pressure from other gas clouds pushes the gas inward. C) Opposite charges in the gas attract. D) Some gas is sent outward, causing the rest to move inward to conserve momentum. E) Pressure from light from nearby stars pushes the gas inward.
The concept of force is fundamental to
A) Newton's theory of gravitation. B) Einstein's theory of gravitation. C) both of these D) neither of these
Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations currently in existence?
A) the average survival time of the civilizations B) the lack of metals for technology C) the speed of technological development D) the expansion of the universe E) the number of supernova explosions