Скачать или смотреть True Limits of Humanity || Final border of humanity || Observable universe ||

True Limits of Humanity || Final border of humanity || Observable universe || #observableuniverse



The universe itself is still expanding. Although the current expansion of the universe is not as rapid as during the Big Bang, it is just as real and important. As a result of the expansion of the universe, all galaxy groups are getting continually farther away from each other.

Many galaxies are so far away from the earth that the expansion of the universe causes them to recede from the earth at a speed faster than light. While special relativity prevents two local objects from ever traveling faster than the speed of light relative to each other, it does not prevent two distant objects from traveling away from each other faster than the speed of light as a result of the expansion of the universe.

Since these distant galaxies are receding away from earth at a speed faster than light, the light from these galaxies will never reach us, no matter how long we wait. Therefore, these galaxies will always be outside of our observable universe.

Another way of saying this is that although the size of the observable universe is increasing, the size of the actual universe is also increasing.

The edge of the observable universe cannot keep up with the expansion of the universe so that many galaxies are eternally beyond our observation. Despite this limitation on observational abilities, the universe itself still has no edge.


Video credits:
ESO ; esohubble


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