What hides beyond the universe? Is the universe infinite? To understand what the universe is, we must start from the concept of observable universe, that is, planets, stars, solar systems, galaxies, which can be observable.
If we suppose that the universe is isotropic, it has properties independent of the direction in space, the distance to its edge is the same, no matter where we look, and its shape is spherical. We look much further, as the light reaches us.
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