We always hear that people are sorted into types and groups automatically at a gathering or any similar activity. Hubble Space Telescope (HST) found a direct proof of this behavior having by globular cluster. Heavier stars are sinking into the cluster’s core and the ligher stars accelerate to the boundary of the cluster.
Quick facts: A typical globular cluster contains several hundred thousand stars. Although the density of stars is very small in the outskirts of such stellar systems, the stellar density near the center can be more than 10,000 times higher than in the local vicinity of our Sun. If we lived in such a region of space, the night sky would be ablaze with 10,000 stars that would be closer to us than the nearest star to the Sun, Alpha Centauri, which is 4.3 light-years away (or approximately 272,000 times the distance between Earth and the Sun).
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