What are open cluster and optical telescope ? Random Facts part 7

Do you know about open cluster and optical telescope? In this article you are going to know about them only, so let's start.

Open cluster is a group of a few thousand stars formed from the same giant molecular cloud. These stars are loosely gravitational bound to each other. More than 1100 open clusters has been discovered in the Milky Way Galaxy. Open clusters appear as faint, blurred patches of the light to the naked eye. But are huge and are several times bigger than Earth.

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An Optical telescope is that gathers and focuses light magnified image of a celestial object. There are mainly three types of telescopes: Refractors which use lenses, Reflectors which use mirrors and Catadioptric which is the mix of Refactors and Reflectors. Galileo generally credited t first use telescope for astronomy.   

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