This is the first time that dark matter has been found with a distribution that differs substantially from the distribution of ordinary matter.

这是第一次暗物质已经发现了分布很大不同的分配普通物质。

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This has posed a challenge for scientists trying to figure out where dark matter is.

FORBES: Mapping The Universe Through Collective Brainpower

This means that normal matter collapses more slowly than dark matter, and that when it does so it has a tendency to oscillate, generating a sound wave.

ECONOMIST: Astronomy