Linked Questions

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2answers
2k views

Why can't some light ever reach earth? [duplicate]

Note: I'm a layman in physics. Excuse me if this question is a duplicate, I lack the knowledge in technical terms to find the answer to this by research (I've tried). Let's suppose there's a star ...
0
votes
1answer
294 views

Can we see beyond the Hubble Volume? [duplicate]

The wiki article on the Hubble volume says that the Hubble volume is often confused with the limit of the observable universe. This thread: When will the Hubble volume coincide with the volume of the ...
0
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0answers
195 views

Can we really see new objects in future? [duplicate]

From Wikipedia: Some parts of the Universe are too far away for the light emitted since the Big Bang to have had enough time to reach Earth, so these portions of the Universe lie outside the ...
49
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5answers
9k views

Can space expand with unlimited speed?

According to this article on the European Space Agency web site just after the Big Bang and before inflation the currently observable universe was the size of a coin. One millionth of a second later ...
12
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4answers
2k views

Can matter leave the cosmic horizon?

Cosmic horizon in the de Sitter space is a sphere, centered at the observer with finite radius where the red shift due to cosmic expansion becomes infinite. Given that no information can be ...
10
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4answers
4k views

Misconceptions about the universe - Hubble Sphere

I recently watched Veritasium's (excellent) video "Misconceptions about the Universe". However, he said something (at 2min 25s) which I think is wrong. Can somebody please clarify this one way or the ...
3
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4answers
732 views

Exploring beyond event horizons

In the expanding universe the velocity of separation between galaxies depends upon how far they are. If they are much far away will they have relative velocity of separation greater than speed of ...
4
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1answer
3k views

The difference between comoving and proper distances in defining the observable universe

"The radius of the observable universe is estimated to be about 46.5 Gly." If I understand correctly, it means the most distant object that we can see right now is 46.5 Gly away (at present), but it ...
1
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2answers
186 views

What is outside the boundaries of our universe (Future horizon) [duplicate]

I m having difficulty understanding what is after the "Future Horizon" as defined per wikipedia https://en.wikipedia.org/wiki/List_of_cosmological_horizons#Future_horizon I read the similar "If the ...
1
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0answers
60 views

With what fraction photon quanta emission rate is decreased in the expanding universe? [closed]

Light from edge of the observable universe has travelled 13.8 billion light years so far. And, that edge itself has travelled 32.2-33.2 billion light years (that's why actual radius of observable ...