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Great Tumefaction

Published: 1st September 2021

Citation: Astronist Institution. (2021). Great Tumefaction. Available: Last accessed [enter date e.g. 1st Sept 2021].

noun  Astroeschatology

the predicted future event in which the Sun expands and eventually engulfs the Earth.



Astro-English: from Astronese, the word tumefaction is used to denote “that which is swollen” or “that which is expanding”; use of the word great denotes a significant event or phenomena that is universally relevant; in the context of outer space, this phrase therefore means “the inevitable swelling of the Sun to the point at which is will engulf Earth.”

Encyclopaedic entry for “Great Tumefaction” on

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