Hubble is getting into the Halloween spirit with its photo of the galaxy cluster Abell 611. This, like all galaxy clusters, is a cosmic mystery to astronomers who aren't sure how it is able to stay together since there doesn't seem to be enough mass to keep it from flying apart.
Hubble is getting into the Halloween spirit with its photo of the galaxy cluster Abell 611. This, like all galaxy clusters, is a cosmic mystery to astronomers who aren't sure how it is able to stay together since there doesn't seem to be enough mass to keep it from flying apart.
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