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After all the trouble, due to turbulence, the real star may not even reveal the true quality of your telescopes or give you perfect collimation. An artificial star will provide you with an excellent alternative means to do the star test anytime and anywhere you want, without all the drawbacks of real stars.
Scientists think that 20 out of the 30 stars nearest to Earth are red dwarfs; however, none of them can be seen with the naked eye. The closest star to the sun, Proxima Centauri, is a red dwarf. Despite its frequent appearance, the term red dwarf does not refer to a single kind of star. It is frequently applied to the coolest objects, including K- and M-dwarfs, which are true stars, and brown dwarfs, often referred to as failed stars because they do not sustain hydrogen fusion in their cores.