Previous studies with Hubble and NASA's Chandra X-ray Observatory found evidence of dark matter in entire clusters of galaxies such as the Bullet cluster.
此前由哈勃望远镜和NASA的钱德拉X射线望远镜联手，观测整个星系群(例如：Bullet Cluster)时曾找到过暗物质的存在证据。
Previous studies with Hubble and NASA's Chandra X-ray Observatory found evidence of dark matter in entire clusters of galaxies such as the Bullet cluster.
此前由哈勃望远镜和NASA的钱德拉X射线望远镜联手，观测整个星系群(例如：Bullet Cluster)时曾找到过暗物质的存在证据。
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