Astronauts observing from a space station need a telescope with a light-gathering power 15,000 times that of the dark-adapted human eye (Note: see problem 4), capable of resolving detail as small as 0.1 arc seconds at a wavelength of 550 nm, and having a magnifying power of 250. Design a telescope to meet their needs. Could you test your design by using it to observe stars from the surface of Earth?
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