Let's talk about the telescope this time, because it is he who is the main astronomical instrument. For example, do you know that a telescope with a concave mirror lens is called a reflector, and a telescope with a lens lens is called a refractor? The purpose of the telescope is to collect more light from celestial sources and increase the angle of view under which a celestial object is visible. The telescope increases the apparent angular dimensions of the Sun, Moon, planets and details on them, as well as the angular distances between stars, but stars even in a very strong telescope from - due to the great distance, they are visible only as luminous dots.
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