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Variable star
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====Luminous red nova==== [[Image:V838 Monocerotis expansion.jpg|upright=1.2|right|thumb|Images showing the expansion of the light echo of [[V838 Monocerotis]]]] {{main|Luminous red nova}} Luminous red novae are stellar explosions caused by the merger of two stars. They are not related to classical [[novae]]. They have a characteristic red appearance and very slow decline following the initial outburst.
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