There are basically three types of telescopes: Refractors, Catadioptrics and Newtonians. The first two are quite expensive to manufacture with benefits not justifying the cost. Hence we chose to make the Newtonians only. Newtonian reflecting telescopes have a perfectly achromatic (free of false colours) image that is viewed by the eyepiece at right angles to the direction of the object being viewed to make sky viewing comfortable. The eyepiece is near the front end of the tube so the overall height of the telescope is also less.
What you can see with a telescope:
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