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Overall, there are as many as an estimated 1×1024 stars (more stars than all the grains of sand on planet Earth). While it is often believed that stars only exist within galaxies, intergalactic stars have been discovered. A multi-star system consists of two or more gravitationally bound stars that orbit each other.
Stars shine because of the nulclear reactions that take place making them excessive hot .?
Stars shine because they are extremely hot (which is why fire gives off light — because it is hot). The source of their energy is nuclear reactions going on deep inside the stars. In most stars, like our sun, hydrogen is being converted into helium, a process which gives off energy that heats the star.