The observable universe of a given observer encompasses the volume of space from which information - particles, radiation - could ever (past, present or future) reach that observer.
Questions tagged [observable-universe]
228 questions
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What kind of accuracy could one get with Pi to 40 decimal places?
I've come across the following YouTube video on the Numberphile channel: https://www.youtube.com/watch?v=FpyrF_Ci2TQ
which mentioned that 38 decimal places of pi (i.e. 39 digits) is all you need to calculate the circumference of the observable…
Eliseo D'Annunzio
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Is the observable universe growing or shrinking?
For a lack of better word, I used growing and shrinking in the question, but what I really mean is: Are objects that are now in the observable universe passing getting out of range in the future, or are objects that are now outside of the observable…
kutschkem
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Can objects within our Hubble sphere be influenced by objects outside of our Hubble sphere?
I feel like this is a silly question but I am having trouble wrapping my head around it. Lets use Andromeda as an example, since it has its own observable universe (slightly shifted from ours but with the same radius) does that mean that it would…
Joe
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Observable universe thought experiment
Imagine 3 objects: A, B, and C, positioned along a straight line in space:
A....................................B...................................C
A and C move at the speed of light towards B.
A and C are at an equal distance from B.
A and C are…
potato
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What if we could use Stars as mirrors to see past the observable universe?
Let's say that there is a galaxy on the edge of the observable universe. Let's say also that in the near future we create a specific camera feature that turns everything we see on screen to a mirror.
The question: Can we use Stars of that Galaxy to…
