Why there is not much antimatter in the universe?

On searches for antimatter in space…

The observed domination of protons, neutrons and electrons over their antiparticles means that our universe has got the so called baryon quantum number. This is composed of baryon numbers of each of nucleons. It would be unnatural to assume that an excess of any quantum number, including that of baryons, existed ever since the birth of the universe, i.e., since the Big Bang. The excess of baryons, which is observed today, could be formed during the primordial stage of the development of the universe if the specific phenomena took place then, which for the first time were characterized by a Nobel laureate Andrei Sakharov in 1966. Although there is no revealed regions which might consist of antiparticles within the limits of the visible part of the universe, it is not possible to exclude the existence of anti-worlds in the distant, invisible regions of the universe.

Antimatter in the universe is not ruled out

There must be a void between a world and anti-world, otherwise they annihilate each other.

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