Based on Function Follows Form (FFF) theory, I postulate that it is because the Crab nebula is the youngest nebula still in its infancy!!
The crab nebula is only about 1000 years old, because it is reported in Chinese and Arab Astronomy files in the year 1054!.
According to FFF theory, the former ejected (sun) starspot black holes of different sizes present in the exploding former star of the Crab nebula, are mixed up by the explosion, they start to meet each other pushed by plasma tails, just like ball lightning.
If they are of equal size they form stable Herbig haro systems.
If they have not the same size, a splitting process with gamma flares or bursts is the result. (see image below)
Related article in Newscientist: Mystery flares betray hidden force within Crab nebula
19:00 06 January 2011 by Rachel Courtland
Quote: Forget the Large Hadron Collider: an interstellar dust cloud called the Crab nebula has been identified as the most powerful known particle accelerator in the universe. But exactly how it boosts particles to record-breaking speeds is a mystery…
Two orbiting telescopes have revealed that the nebula, which sits some 6500 light years from Earth, releases brief, bright flares of gamma-rays, a pair of papers released today report. These flares are most likely produced by electrons that have been whipped up to record-breaking speeds……
These are "the highest particle energies ever associated with a single source", says Elisa Bernardini of the DESY research centre in Germany in an accompanying paper.
The discovery of the flares comes as a surprise.”
see also: "Surprising Gamma flares in Crab Nebula"
According to my FUNCTION FOLLOWS FORM (FFF) theory The origin of these forces has to be found in the uncovered SPLITTING AND PAIRING complexity of MICRO and MINI BLACK HOLES inside Nebula.
These mini black holes inside Nebula are supposed to be ejected from the original exploded star as SUCCESSORS of the original STELLAR SPOTS which are supposed to be the result of COMETS CRASHED INTO THE STAR.
As a result there is a firm reason to search for the origin of the mini black holes inside COMETARY NUCLEI. http://bigbang-entanglement.blogspot.com/2010/11/comet-hartley-2-hides-two-gas-jets.html
In my opinion, the star itself is responsible for the production of Cometary nuclei or mini black holes, by magnetic stellar outbursts during its life. So not the Kuyper belts or Oort clouds are resposnible.
For more information on Splitting and Pairing black holes inside Nebula, see:.
Three Nebula: Carina, Crab and Eagle Nebula.
Other related information:
Is there other evidence for the Sunspot-Black hole-Gas-pillar relation?
Yes I believe so:
So we may suggest that the knotty black holes in this (infant) Helix nebula still did not have the chance to pair with other black holes or come to a black hole splitting process!. Perhaps the Helix nebula is too small for a Crab comparable mini black hole pairing and splitting process?
This blog is under construction.
For FFF theory see: