Re: Balloon-Borne Instrument Collects Antimatter

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

"Clint O'Dell" <> writes:

> I'm no physicist, but doesn't anti-matter and matter annihilate each other?
> How could you capture anti-matter that is floating around with matter?

Most of what we consider matter is actually empty space, and especially high up in the atmosphere there is enough space so that antiparticles can move for fairly long distances before crashing into some matter (in medical PET scanning radioactive substances are used that release positrons (i.e. anti-electrons) and they on average just get 5 millimetres in the brain before annihilating).

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