Oxana
@oxana23
To estimate the size of the observable part of the Universe, or the Metagalaxy, in living images, mentally reduce the Earth's orbit (its diameter is 300 million kilometers) to the size of the inner electron shell of the classical model of the Boron atom (its radius is 0.53 × 10-8 cm). Then, the distance to the Galactic center will be 10 cm.
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