Habitability generally refers to an environment capable of sustaining
A) human life
B) plant life
C) microbial life only
D) any kind of life
D
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Time Dilation: Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth. Compared to the twin who remained on Earth, the astronaut twin is
A. younger than the Earth-twin. B. the same age as the Earth-twin. C. older than the Earth-twin. D. The ages cannot be determined from the information provided.
The constellation shaped like a W is
A) Cassiopeia. B) Pegasus. C) Canis Major. D) Taurus. E) Andromeda.
The temperature variations of the cosmic microwave background observed by Planck agrees well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation B) only the Big Bang, but not inflation C) not the Big Bang, but inflation D) neither the Big Bang nor inflation
The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light gathering power of a 1.6 m telescope to that of the human eye is ____
a. 2 b. 4 c. 20 d. 400 e. 40,000