Foe (unit)
A foe is a unit of energy equal to 1044joules or 1051ergs, used to express the large amount of energy released by a supernova. A bethe (B) is equivalent to a foe.
The word is an acronym derived from the phrase [ten to the power of] fifty-one ergs. It was coined by Gerald Brown of Stony Brook University in his work with Hans Bethe, because "it came up often enough in our work". The bethe is named after Hans Bethe. It was coined by Stephen Weinberg.
This unit of measure is convenient because a supernova typically releases about one foe of observable energy in a very short period (which can be measured in seconds). In comparison, if the Sun had its current luminosity throughout its entire lifetime, it would release 3.827×1026W × 3.1536×107s/yr × 1010 yr ≈ 1.2 foe.
A foe is approximately 186.3 times the rest mass energy of the Earth.
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