Close encounters

dcterms modified equal to or less than 2020-10-26T20:06:31.917Zequal to or more than 2020-10-26T20:06:31.917Z
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definition In a star cluster, coming across of two stars so closely that their orbits alter by their mutual gravitational attractions. As regards an asteroid or comet, a situation when it crosses the Moon's orbit and approaches the Earth with a risk of collision.
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contributor AAS_Frey.Katie original