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The thread title had me thinking for a moment before I opened it up.
Does infinity really exist in nature or is it just a mathematical construct?
The closest practical application for infinity I can think of is in describing the geometry of light rays hitting different parts of a telescopes objective from a star. With the angle between them being for all intents 0 degrees, placing the source effectively at infinity.
Its not infinity, but you wont measure the difference on a telescopes mirror.
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