My next post will be on how Antimatter is created , keep following !
By the way , antimatter is not dark energy , the Universe is composed of 71.4% dark energy 24% dark matter and 4.6% ordinary matter , that means all planets moons suns and celestial bodies are within those 4.6% . Antimatter and dark energy are two different concepts . When the Big Bang occurred there was more matter than antimatter and physicists believe that all the antimatter annihilated with the big amount of matter and everything left was the rest of the matter , so dark energy can't be antimatter because there is more dark energy(71.4%) than matter (4.6%) and if there is more antimatter than matter the Universe wouldn't exist because all the matter would be annihilated .
Physicists believe that when the big bang occurred the same amount of matter and antimatter should be created but everything we see in the universe is made of matter , there is no antimatter , so one of the most challenging and mysterious problem in physics is to know where is the rest of the antimatter or why did the universe create more matter than antimatter , it is a long journey into physics , all we can say now is that dark energy is not antimatter !