An optical instrument designed to observe and study stars and other celestial objects in detail.
From astro- (star) and -scope (from Greek skopein, to view or examine). An older term for what we now call a telescope or specialized astronomical instrument.
Early astroscopes were limited by the quality of their lenses, but they represented humanity's first deliberate tools for piercing beyond the limits of unaided vision—Galileo's telescope was essentially a form of astroscope.
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