Telescope lens usually has large aperture.Why?
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An astronomical telescope has a large aperture to
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How to Choose A Telescope for Astronomy | Types of Telescopes - Sky & Telescope
How to Choose A Telescope for Astronomy | Types of Telescopes - Sky & Telescope
How to Choose A Telescope for Astronomy | Types of Telescopes - Sky & Telescope
Abrams Planetarium Telescope Information Page
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