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Consider the following statements about the Hubble Space Telescope (HST): 1. It operates mainly in the visible, ultraviolet, and near-infrared wavelengths. 2. It is placed in a geostationary orbit above the Earth. 3. It has contributed to measuring the rate of expansion of the Universe. Which of the above statements is/are correct?

1. Only 1 and 2
2. Only 1 and 3
3. Only 2 and 3
4. All 1, 2 and 3

Correct answer: Only 1 and 3

Solution

Hubble observes mainly in visible, ultraviolet, and near-infrared wavelengths, so statement 1 is correct. It is in low Earth orbit, not geostationary orbit, so statement 2 is incorrect. It has helped estimate the expansion rate of the Universe, so statement 3 is correct.

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