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Meissa
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==Cluster== This star is the dominant member of a 5-million-year-old star-forming region known as the Ξ» Orionis cluster,<ref name=aaa504_1_199/> or [[Collinder 69]]. The intense ultraviolet energy being radiated by this star is creating the [[Sh2-264]]<ref name=rmaa24_217/> [[H II region]] in the neighboring volume of space, which in turn is surrounded by an expanding ring of cool gas that has an age of about 2β6 million years. The expansion of this gaseous ring may be explained by a former binary companion of Meissa that became a [[Type II supernova]]. Such an event would also explain the star's [[peculiar velocity]] with respect to the center of the expanding ring, as the explosion and resulting mass loss could have kicked Meissa out of the system. A potential candidate for the supernova remnant is the [[neutron star]] [[Geminga]].<ref name=aaa309_892/> However, the last is unlikely given the distance between Geminga and the cluster.<ref name=aaa435_2_625/>
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