From William Heslop
“It is a mystery of cosmic proportions: why is the universe filled with matter and not antimatter?” your story on antihydrogen begins (1 November, p 9). Really? Or is this just an unnecessary assumption that complicates our understanding of the universe?
After all, is there any direct evidence that other star systems are not made of antimatter? Given the scale of interstellar separation, and the virtual impossibility of interaction between the constituent particles of each system, this would seem entirely plausible. And if not on this scale, then perhaps even larger. Matter and antimatter galaxies? Galactic clusters? Galactic super-clusters?
Guildford, Surrey, UK
