Foe (unit) Foe (unit) A foe is a unit of energy equal to 10 joules or 10 ergs, used to express the large amount of energy released by a supernova. The word is an acronym derived from a part of the pronunciation "ten to the power of fifty-one ergs". It was coined by Gerald E. Brown of Stony Brook University in his work with Hans Bethe, because "it came up often enough in our work". A bethe (B) is equivalent to a "foe". The "bethe" is named after Hans Bethe. It was coined by Steven Weinberg. This unit of measure is convenient
Orbital replacement unit (HST) of fasteners). HST servicing mission 3A (SM3A) replaced (or added) 15 ORUs, e.g. it replaced the DF-224 computer with the "Advanced Computer". The electrical system of the International Space Station also has such subsystems that provide power generation, power distribution and energy storage. Orbital replacement unit (HST) An orbital replacement unit or orbital replaceable unit is a modular component of spacecraft that can be replaced upon failure either by robot or by extravehicular activity. The Hubble Space Telescope (HST) was designed with 70 such parts, including scientific instruments and limited-life items such as batteries. On HST some parts were designed