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light cone

[ lahyt-kohn ]
/ ˈlaɪt ˌkoʊn /
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noun Astrophysics.
a theoretical space-time diagram in three dimensions, represented as a cone, or two cones with one in the past and one in the future, and modeling the space that light from an event or a particle traveling at the speed of light from that event can occupy.
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Origin of light cone

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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