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Resolution.
To improve a reflecting telescope's light gathering ability (and thus enable it to detect fainter objects), make its primary mirror larger. However, to improve its resolving power (the ability to distinguish between two close light sources), make it wider, which is not necessarily the same thing. The further apart the outermost edges of its mirror(s) are, the sharper the image. This applies even if the mirrors are in separate 'scopes.
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Does Pat Sajak had his twin brother?
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Nothing it was the twin towers that got hit by a plane.
