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SlideshowReport

Light-Gathering Power

Description
Because a large primary mirror collects more starlight than does a smaller one, a larger telescope
produces a brighter image than a smaller one, all other things being equal. The same principle applies to telescopes that
collect light using an objective lens rather than a primary mirror. The two photographs of the Andromeda Galaxy were taken
through telescopes with different diameters and were exposed for equal lengths of time at equal magnification. (AURA)
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