The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
There are two types of telescopes in modern Earth-based observatories: optical and radio. Almost all large optical telescopes use mirrors, not lenses, and detect both visible light and infrared radiation. Radio telescopes use metal dishes to focus radio waves from space onto receivers.
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Keck
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Gram Telescopio Canarias
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