Re: Balloon-Borne Instrument Collects Antimatter (fwd)

Anders Sandberg (
19 Aug 1999 00:14:51 +0200

"Clint O'Dell" <> writes:

> >If such a galaxy were to collide with a normal-matter galaxy the fireworks
> >would be quite amazing.
> It would be quite scary! I assume that the side with the most matter of its
> type would win. Is there a way that our side can gain an advantage so that
> were not annihilated?!

Keep well away?

I'm not that worried though, since the signature of matter-antimatter annihilation would be easy to detect across the universe and to my knowledge no significant sources of such radiation has ever been observed (the closest thing was some emissions from a core jet of our own galaxy).

> Since annihilation produces pure energy would that
> hold the two universes apart in a rhythmic pattern for a while? I'm
> picturing power much greater than a supernova.

Definitely much more than a supernova. And much messier - when large amounts of matter and antimatter react the result isn't pure energy but a very hot nuclear plasma. This would likely blow away matter and antimatter, but it could very well be turbulent and contain a mixture of them. Such an ambiplasma can actually be fairly stable if it is thin enough, since the collisions between particles are rare enough to just heat it up. Some physicists (most notably Hannes Alfven) have suggested this as a mechanism to explain the matter predominance, but most physicists today go for other explanations.

> On another note.
> How can an anti-matter galaxy and a posi-matter(?) galaxy co-exist?
> Is this because there is nothing between the galaxies? All empty space?


Anders Sandberg                                      Towards Ascension!                  
GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y