Variable Stars

Variable Stars: Variable stars are stars that dim and brighten in cycles. These cycles can last from a few hours to many years. Variable stars can be caused by many factors but there are 2 main ones. The first one is when there is a normal star that is eclipsed by some other celestial body making it dimmer but still visible. Once the object passes over, the star gets brighter again. This usually happens in a binary star system when one star passes over the other. The second reason is a dying star that runs low on fuel. This causes the star to start collapsing making it dimmer but before it can collapse all the way (Super Nova) more fuel is ignited due to being condensed from the near collapse. This once again brightens up the star and makes it expand again. This too happens in cycles.

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