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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.
Satellites, of course! Satellites are any objects that revolve around (orbit) another object in space. Some satellites are natural, while others are artificial (man-made). The moon is an example of a natural satellite that orbits the Earth. We're going to focus, though, on the man-made satellites. Artificial satellites are machines that humans launch into orbit, usually around the Earth. Artificial satellites can be sent to orbit other planets, too. For example, there are currently satellites orbiting the Moon, the Sun, and several other planets, including Mercury, Venus, Mars, and Saturn.