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发帖数: 1994 | 1 A Star Cluster in Motion
Credit: Adam Block (NOAO)
Explanation: Star clusters are a swarm of complex motions. The stars that compose globular
clusters and many open clusters all orbit the cluster center, occasionally interacting,
gravitationally, with a close-passing star. The orbits of stars around the cluster are typically not
as circular as the orbits of planets in our solar system. Cluster stars frequently fall more
directly toward the center and many times trace out un |
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