When we analyze whether a world is a possible home to life, the key thing we look for is
A) the past or present existence of liquid water.
B) evidence of atmospheric oxygen.
C) the presence of organic molecules such as amino acids.
D) surface coloration changes that could indicate vegetative growth.
A
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When a nucleus in an excited state decays to the ground state, the particle emitted is
a. an alpha particle. b. a beta particle. c. a gamma ray. d. an x-ray. e. none of the above.
The type of fuel created in the breeder reactor is
A) uranium-238. B) cow dung. C) plutonium. D) uranium-235. E) deuterium.
When a hot object makes thermal contact with a cold object, the direction of
A) temperature is from hot to cold. B) internal energy flow is from hot to cold C) both of these D) neither of these
The Milky Way is smaller than most members of the Local Group
Indicate whether the statement is true or false