“Ursa Major cluster”的概念、定义、翻译、参考文献-科学参考

单词	Ursa Major cluster
释义	Ursa Major cluster [`ǝr·sǝ `mā·jǝr ´klǝs·tǝr] ^ASTRONOMY 1. A group of about 126 stars, including 5 stars of the constellation Ursa Major; the sun is passing through this cluster which occupies a spherical space of about 450 light-years in diameter. 2. A cluster of galaxies in the constellation Ursa Major having a redshift of about 0.051.
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