That is, the observable universe is a spherical region centered on the observer. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. There may be 2 trillion galaxies in the observable universe, although that number was estimated in 2021 at only several hundred billion based on data from New Horizons.
The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.
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