All Questions
Tagged with redshift dark-energy
8
questions
-2
votes
1
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213
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Shouldn't the Friedmann equation take into account the massive extra distance traveled during the time for gravity to travel across the universe? [closed]
I’ve got a question that has been bothering me for the past few years that of the few sources that are only somewhat related to this, none of them say anything about this should be wrong so I can’t ...
- 21
2
votes
1
answer
149
views
Can the expansion of the universe cool my beer?
So the expansion of the universe stretches the light traveling through the void, as demonstrated by the cosmic microwave background radiation. These photons are lower energy than when they are ...
4
votes
1
answer
158
views
How does the Sachs-Wolfe effect confirm the existence of dark energy?
How is the Sachs–Wolfe effect and the existence of voids significant in providing physical evidence for dark energy?
user48394
2
votes
0
answers
79
views
Definition of space - to cope with "space expansion"
I've searched quite a lot but found no satisfying definition, so please:
How do we actually define space when talking of "space expansion"? Isn't it just a metric, a dimension we measure, instead of ...
- 31
3
votes
3
answers
761
views
Dark energy and light red shifting
When light is red shifted from distant galaxies, the photons have lost energy. When dark energy pushes objects apart, those objects have gained energy from a larger gravitational potential. Is the ...
- 171
1
vote
2
answers
782
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If objects don't move when the universe expands, how can the expansion result in redshift?
I am approaching this topic from a layman's perspective and view this as a logic puzzle, but when someone tries to get me to accept the logic, I'm never convinced by their arguments.
According to ...
- 11
6
votes
1
answer
2k
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Does the universe expand at the same rate everywhere in the universe?
Specifically, I am wondering if some areas of the universe expand faster than other areas and whether the faster expanding areas diffuse the expansion through the slower expanding areas or does the ...
- 177
7
votes
1
answer
335
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Dark Energy Expansion
The new Cosmos extra features mentions that at about 6,771,500,000 years ago the universe began an accelerated expansion. How do we know this? What evidence do we have for this renewed and accelerated ...
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