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Calvera (X-ray source) : ウィキペディア英語版 | Calvera (X-ray source)
In astronomy Calvera is the nickname—based on the villain in the 1960 film ''The Magnificent Seven''—of an X-ray source known as 1RXS J141256.0+792204 in the ''ROSAT All-Sky Survey Bright Source Catalog'' (RASS/BSC). It lies in the constellation Ursa Minor and is identified as an isolated neutron star. It is one of the closest of its kind to Earth. ==References==
*Pennsylvania State University.
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