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# 托福TPO-42 Lecture 2-4

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You are talking about the shape of the cluster though, not the shape of the galaxies within the cluster.

Right. For example, let’s consider the Coma Cluster.

It’s a symmetrical cluster basically spherical in shape, but the individual galaxies within it are elliptical

they’re not spherical or spiral shaped.

But the cluster itself shows spherical symmetry. Um, the Virgo Cluster, on the other hand, is considered irregular.

There’s no symmetry to its overall shape, no central concentration of galaxies,

but it happens to have both elliptical and spiral galaxies within it.

Another question. You were saying how some clusters have more galaxies than others.

How many galaxies does a cluster have to have in order to even be a cluster?

 重点单词 查看全部解释 overall [əuvə'rɔ:l] 想一想再看 adj. 全部的，全体的，一切在内的adv. symmetry ['simitri] 想一想再看 n. 对称(性), 匀称，整齐 联想记忆 coma ['kəumə] 想一想再看 n. 昏迷 联想记忆 symmetrical [si'metrikəl] 想一想再看 adj. 对称的 联想记忆 concentration [.kɔnsen'treiʃən] 想一想再看 n. 集中，专心，浓度 irregular [i'regjulə] 想一想再看 n. 不合规格之物adj. 不规则的，不整齐 联想记忆 spiral ['spaiərəl] 想一想再看 n. 旋涡，螺旋形之物adj. 螺旋形的，盘
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• 托福TPO-42 Lecture 2-5 2016-10-04
• 托福TPO-42 Conversation 2-1 2016-10-10
• 托福TPO-42 Conversation 2-2 2016-10-11
• 关键字： 听写 托福 练习 训练 TPO

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