Which radiation is the most useful to map the structure of our Galaxy?
A. 21-cm radio radiation
B. X-rays
C. gamma rays
D. far ultraviolet
Answer: A
Physics & Space Science
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In a diagram of electric field lines, what is represented by lines that are drawn closer together?
A. a more positive field B. a more negative field C. a stronger field D. a weaker field E. nothing (artistic license)
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Pre-main sequence stars are above and to the right of the main sequence
Indicate whether the statement is true or false
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Earth's inner core is
a. liquid. b. part solid and part liquid. c. solid. d. molten.
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Neutron stars seem to travel a good deal faster than most stars in orbit about the Galaxy
Indicate whether the statement is true or false
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