The volume of matter and antimatter in the universe should be about equal, according to most theories about the formation of the universe.
Due to a process known as "baryogenesis," the universe is made up of piles and piles of matter, but so little antimatter it's almost undetectable. Reasons vary from "we're working on it" to "who the hell knows." (Baryogenesis is the physics version of the medical "idiopathic," which sounds incisive but actually means "you just don't know, but I don't know in Latin."
Assuming the most likely theory – that baryogenesis is a misspelling of Barry O'Genesis, a giant gaelic space monster that devours antimatter because it's the low-calorie diet food of those who bestride the cosmos and snack on them – it doesn't matter why there's no antimatter around. We can make it even when we can't find it.
At the current rate of production of all the world's supercolliders combined, it would take 1,000 years to make a microgram of antimatter, according to TechStew.
Can hope and overcomes the laws of physics? Why not? It's worked for us so far.
That's a predictable rate of progression, at least, though it doesn't really compare to the 80 supertankers full of antimatter TechStew estimates would be needed to fuel a real trip to Proxima Centauri.
Clearly fuel efficiency will be an issue. So far, Prius is not involved in either the real space program or Jemison's aspirational, motivational project.
The elements that will make 100YSS or something like it successful are persistence and determination – and time, according to Jemison.
"We’re embarking on a journey across time and space," Jemison said. "If my language is dramatic, it is because the project is monumental. This is global aspiration. And each step of the way, its progress will benefit life on Earth. Our team is both invigorated and sobered by the confidence DARPA has in us to start an independent, private initiative to help make interstellar travel a reality."
This is an engineering project, however, not sociology or education. So regular conferences in odd locations are called for to allow engineers to publicly scoff at one another's work and complain about how Microsoft is trying to dominate the universes with Microsoft Con-Matter rather than the open-source anti-matter.
Icarus Project/Adrian Mann