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Basic details about stars
Stars are the lights found in the night sky. They are actually bodies of [[hydrogen]] undergoing [[fusion]].
Stars are extremely large, extremely luminous bodies of gas at great distances. They are the most obvious features found in the universe. They are principally composed of [[hydrogen]] that is undergoing nuclear [[fusion]] to become [[helium]]. Our Sun is the nearest star to Earth, at a distance averaging 93 million miles. The Earth orbits the Sun in a period of approximately 365.25 days, and this defines the [[year]]. The diameter of the Sun, which is a typical star, is about 870,000 miles and its power output is about 10<sup>26</sup> watts.
Stars are also often used as symbols on flags, such as the American [[flag]] (50 stars) and the flag of the [[European Union]] (12 stars).
[[category:astronomy]]
[[category:astronomy]]