The 'size' of a telescope's light collecting area | Determines how much 'light collecting power' a telescope has - ability to see fainter and fainter objects --> farther back in cosmic time! | Can also impact a telescope's ultimate angular resolution through diffraction | Bigger telescope _________ = 'diffraction limit' is smaller

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1. The 'size' of a telescope's light collecting area | Determines how much 'light collecting power' a telescope has - ability to see fainter and fainter objects --> farther back in cosmic time! | Can also impact a telescope's ultimate angular resolution through diffraction | Bigger telescope _________ = 'diffraction limit' is smaller