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How vast is the universe really?

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Anonymous

14y ago
Updated: 8/19/2019

It depends on exactly what you're measuring.

The vast majority of cosmologists (that is, essentially all except for a few kooks) think that the universe is expanding. That, coupled with the speed of light, means that the most distant objects we can see appear to be at the distance they were from us several billion years ago, and since the universe is expanding, "now" they are further away than that.

The observable universe is a sphere around 28 billion parsecs in diameter.

The observable universe is itself expanding with time. However, for complicated reasons the observable universe (that part of the universe we can see) will eventually stop expanding, at a diameter of about 38 billion parsecs. Anything outside this distance is moving away from us faster than the speed of light (because of the expansion of space itself), and its light can never reach us.

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Wiki User

14y ago

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