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3.what would be the best place to build an optical telescope? 4.A measure of the amount of light given off by a star is its? 5.the first artificial satellite to orbit the Earth was?
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3.what would be the best place to build an optical telescope?

4.A measure of the amount of light given off by a star is its?

5.the first artificial satellite to orbit the Earth was?

User Yves Junqueira
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I can help you with question 5.  The first artificial satellite to orbit the Earth was called Sputnik I, launched by the (then) Soviet Union in 1957.
User NakedBrunch
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