Astronomy is the science of the study of planets stars and other extraterrestrial body's in outer space they will often use things like telescopes and electronic equipment as like but can use the hubble telescope as well
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The two improvements were made in steamships in the late 1800's were steamboats that had the engine in them and the other was the two paddle wheels on both sides(which make it go faster).
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Answer:c)dependent on rivers that flow from outside their borders
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