Velocity of sheep in a vacuum
The theoretical maximum velocity of a sheep in a vacuum is expressed in sheepsecs (Ssx), calculated as follows:
Speed of light (c) divided by wooldrag (Wd) + Welshmen (Wm), where wooldrag is a species-defined drag coefficient determined by the length and pliability of the fleece and Welshmen is the number of locals who have turned up in their wellies, and are hanging on for dear life.
Wooldrags have recently been calculated by researchers at CERN, and the latest experiments shed some light on the phenomenon, but it is still mysterious. The effect is similar to friction here on Earth, but is due to the interaction of the wool and fluctuations in the quantum vacuum. Researchers have applied to the EU for further funding, but it has been put on hold as a result of the recent outbreak of foot and mouth disease.
For example, an unshorn Welsh Mountain Badger Face, with a wooldrag of 67, chased by three Welshmen will ultimately attain a Ssx of c/(67+3), or 4,282.74 km/sec.
Alternatively, a newly-clipped Finnish Landrace, with a wooldrag of 23, worried by just one Welshman has a theoretical Ssx of c/(23+1), or 12,491 km/sec.
Clearly, the difference in these two results means that a compromise standard is required. The El Reg Ssx uses the classic Cheviot as its sheep of choice, with a wooldrag of 50. Wm is in this case 0, since everyone knows that Welshmen do not in fact have intimate relations with sheep and any reference to the same is just a cheap attempt to drum up laughs.
The Vulture Central standard velocity for a sheep in a vacuum is, therefore, c/(50+0), or 5,995 km/sec.
I'm just dying here!