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Reference.org
Orion variable
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<p>An Orion variable is a <a href="/facts/Variable_star/Ac8mp2gy">variable star</a> which exhibits <a href="/facts/Irregular_variable/xWkauC0E">irregular</a> and eruptive variations in its <a href="/facts/Luminosity/1tdhpk9l">luminosity</a> and is typically associated with diffuse <a href="/facts/Nebula/hG6coklY">nebulae</a>. It is thought that these are young stars which will later become regular, non-variable stars on the <a href="/facts/Zero-age_main_sequence/DJ3Wq8kd">zero-age main sequence</a>. Brightness fluctuations can be as much as several magnitudes. </p>