Definitions for variable star
This page provides all possible meanings and translations of the word variable star
variable star, variable(noun)
a star that varies noticeably in brightness
Any star whose brightness varies.
A variable star is a star whose brightness as seen from Earth fluctuates. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: ⁕Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks. ⁕Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it. Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for example, varies by about 0.1% over an 11 year solar cycle.
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"variable star." Definitions.net. STANDS4 LLC, 2015. Web. 19 Apr. 2015. <http://www.definitions.net/definition/variable star>.