Within seconds matter was accelerated through 3 dimensions, expanding and developing very rapidly. Time became a measure of the rate of that expansion, the necessary 4 th dimension. According to Einstein's general theory of relativity light is also affected by gravity. This means that light can be bent 'around' planets, and follow a curved path. Light must travel through the shortest distance available between two points, meaning that the curved path is the shortest distance, hence space itself is curved.
Antimatter is the opposite of matter, with nucleus of antiprotons and orbiting positrons around it.
3 minutes after the Big Bang, the hadrons start to form atomic nuclei such as deuterium and helium. Gas clouds formed and due to the pull of gravity they contracted into stars. The contraction also provides energy for nuclear fusion, so that the stars 'burn'. There two theories on how galaxies and clusters of galaxies formed, one stating that one was created before the other, the other the inverse, we can only say that they exist.