The exact number of atoms in the universe is unknown and difficult to determine precisely. The universe is vast and contains an enormous number of atoms distributed across its various regions, including galaxies, stars, planets, and interstellar space.
However, scientists have made estimates based on observable data and theoretical models. According to current understanding, the observable universe contains an estimated 10^80 atoms. This estimate takes into account the large number of galaxies, the approximate number of atoms in each galaxy, and the vast spaces between galaxies.
It's important to note that this estimate only pertains to the observable universe, which is the portion of the universe that we can currently detect and study. The actual size of the entire universe, including the parts beyond our observable reach, is still a topic of scientific investigation and debate. The total number of atoms in the entire universe could be significantly larger but remains uncertain.