ursa major cluster造句

"ursa major cluster"是什么意思

造句与例句手机版

A much larger cluster within in Our Supercluster is the Ursa Major Cluster.
The Ursa Major cluster is located at a distance of 18.6 megaparsecs ( 60 million light years ) and contains about 30 % of the light but only 5 % of the mass of the nearby Virgo cluster.
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