Ask Astro: How do telescopes see different parts of the electromagnetic spectrum

How do we create telescopes that see different parts of the electromagnetic spectrum? Frank Coulter Pauanui Beach, New Zealand The range of colors or wavelengths that a telescope can observe depends on the design of both the telescope itself and the cameras attached to it. For instance, if you’re building a telescope that will observe mostly in infrared, usually the mirror is coated in silver or gold. For the mirrors of telescopes designed to observe in both optical and infrared, a

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