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Discussion and Debate
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Physical & Life Sciences
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<blockquote data-quote="Astrophile" data-source="post: 76833423" data-attributes="member: 338099"><p>Yes, in the long term the Local Group will separate from the Virgo cluster, although the Virgo cluster itself may stay together.</p><p></p><p>However, it will take a very long time for the distance of the Virgo cluster to increase significantly. The average radial velocity of the Virgo cluster is about 1170 km/s, so in 55 million years (the time taken for light to reach us from the cluster) its distance will have increased by about 70,000 parsecs, or about 210,000 light-years. This is less than 0.5% of the present distance of the cluster. That is what I mean when I say that the expansion of the universe does not affect measurements of the distance of nearby clusters of galaxies.</p></blockquote><p></p>
[QUOTE="Astrophile, post: 76833423, member: 338099"] Yes, in the long term the Local Group will separate from the Virgo cluster, although the Virgo cluster itself may stay together. However, it will take a very long time for the distance of the Virgo cluster to increase significantly. The average radial velocity of the Virgo cluster is about 1170 km/s, so in 55 million years (the time taken for light to reach us from the cluster) its distance will have increased by about 70,000 parsecs, or about 210,000 light-years. This is less than 0.5% of the present distance of the cluster. That is what I mean when I say that the expansion of the universe does not affect measurements of the distance of nearby clusters of galaxies. [/QUOTE]
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