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Questions related to the physical instruments for astronomical observations.

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How are solar systems found again after being discovered?

Discovering a solar system that cannot be seen by the naked eye on earth seems like an easy task with telescopes (e.g. the hubble telescope). … I'm guessing, that our sun is the reference point for the bearing of the telescope at the point of discovery of a solar system. But how do you find this solar system again? …
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