All Questions
Tagged with observable-universe distances
9
questions
-2
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3
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320
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If we could fly off edge of observable universe what would happen? [closed]
If we could be at the edge of expanding universe in a fast space ship such that we could go beyond the edge, what does the science think we might experience?
Would we still be floating in space?
Would ...
- 123
0
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0
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58
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How long does it take for a galaxy (or other object) to disappear behind the cosmic sight horizon?
After looking at this question, I am wondering, how long does it take for a galaxy or other space object, to disappear from our view from the Milky Way due to the expansion of the universe? Assume GN-...
- 6,684
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1
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88
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Computing the over-density of Lyman-alpha emitters
Let's assume that I have observations of $N$ galaxies in a projected area $A$, within a redshift range $\Delta z = z_{max} - z_{min}$. What is the correct way of computing their number volume density? ...
- 103
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1
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479
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Earth as a grain of sand
If Earth was a grain of sand in Buenos Aires
in what point in this observable universe map would be LA be?
- 101
2
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2
answers
561
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How thick is the cosmic microwave background, including the part we cannot see within the observable universe?
What I want to know is how thick the observable universe is from the point of the cosmic microwave background and beyond.
It appears the thickness of the cosmic microwave background itself (the part ...
- 4,381
3
votes
1
answer
667
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Is there a physical limit to how far we can go?
Is there a physical limit to how far we can go? I am thinking there could be based on the following:
1: There are parts of the universe expanding faster than the speed of light that we will never be ...
- 4,381
1
vote
3
answers
881
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Is our universe flat?
I heard our universe is flat. Then one question is puzzling in my mind. If our universe is really flat, why we measure distance from any point across in a spherical way. In other words, why we say, ...
- 1,007
8
votes
2
answers
435
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Is the diameter of the observable universe a relative quantity?
The diameter of my observable universe is 90 billion ly measured in proper distance. But isn't lenght a relative quantity in the theory of Relativity? Could an observer moving at a different velocity ...
- 559
2
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1
answer
801
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What is the radius of observable universe- 46 billion LY or 200 yottameters?
I have found two answers for the radius of the observable universe. Wikipedia (and other places, including this site) say approximately 46 billion LY. I am researching this to study for the National ...
- 21