Which of the following wavelengths can be observed by a telescope located on the Earth's surface?
A) Gamma ray
B) X-ray
C) Radio
D) None of the above wavelengths
A) Gamma ray
B) X-ray
C) Radio
D) None of the above wavelengths
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D) None of the above wavelengths
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http://en.wikipedia.org/wiki/Radio_telescope
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D) None