Linked Questions

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1answer
58 views

Cosmic Inflation and the Distance between an Electron(s) and Their Respective Nucleus [duplicate]

If cosmic inflation is indeed occurring, doe this apply to all space/time? What about the space between an electron and the nucleus? Seems to me if that space is also expanding, atoms should cease ...
2
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0answers
55 views

If the universe is expanding then why does the distance between Sun and the Earth is not expanding? [duplicate]

It has been proved that universe is expanding in the accelerating way. If that is true than the space between the Sun and the Earth must also be expanding. But it is not so, why?
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0answers
46 views

Cosmic Expansion - Why aren't we ripped off yet? [duplicate]

According to Hubble's law, the universe expands exponentially ever since the big bang. If the space-time expands, what effects does it have upon us, (1.Earth, 2.solar system and 3. Milky Way). What ...
2
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0answers
43 views

Is every object in the universe really expanding? Even small scale objects like humans? [duplicate]

So I was asked a question by someone that "if everything in the universe is expanding, then the lens we use to look at stellar objects is expanding as well, meaning we shouldn't be able to tell the ...
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1answer
53 views

Space is expanding but the space around me isn't [duplicate]

Everyone says space is expanding and distances between galaxies growing. But space isn't limited to outside of the earth. Space is everywhere on earth and around me. However I don't notice any ...
0
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0answers
41 views

Space expansion and conservation of energy [duplicate]

The phrase of 'expansion of universe' , as we are led to believe, is mostly referring to an expansion in space. But is space expanding in the sense that the space between two particles is increasing ...
0
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0answers
40 views

Expanding Universe and more [duplicate]

We all are pretty familiar with the Friedmann models of the expanding universe, but at present I would like to concentrate on the model where the universe goes on expanding with the lapse of time. We ...
0
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0answers
34 views

Space within galaxies. Is it stuck by the gravity of the galaxy or expanding and “slipping past”? [duplicate]

I understand that the inter-galactic space is expanding but galaxies themselves are not. What is happening to the space within a galaxy? Is it fixed by the gravity of the galaxy or is it expanding and ...
1
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0answers
23 views

Are atomic energies increasing as the Universe expands? [duplicate]

Starting from the FRW metric (for simplicity flat space, radial direction only): $$ds^2=-c^2dt^2+a(t)^2dr^2$$ If we take $dt=0$ then the proper distance $ds(t)$ between two spatially separated ...
0
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0answers
19 views

The Space Between Us [duplicate]

We are told the universe is expanding at anything between 68 and 73km per second, per megaparsec (depending on the places you look) - so by association, the space between us and anything else out ...
0
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0answers
17 views

expansion universe and proper length [duplicate]

Experimentally, the universe keeps expanding. I do not understand well what is meant by expanding universe. If we assume an inertial reference frame for which space is defined and if in this ...
52
votes
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 ...
29
votes
6answers
5k views

If spacetime itself is expanding, how could we ever tell?

If space is the measured distance between 2 objects, then saying the space expanded is nonsensical unless we have a measuring stick outside of the space fabric to measure the expansion. 2 objects ...
26
votes
4answers
2k views

Can the Hubble constant be measured locally?

The Hubble constant, which roughly gauges the extent to which space is being stretched, can be determined from astronomical measurements of galactic velocities (via redshifts) and positions (via ...
15
votes
2answers
3k views

Is the Cosmological Constant locally zero?

On earth and in our solar system we do not notice any effects of a non-zero cosmological constant. The accelerating expansion of the universe was only detected by observing the most distant supernovae....

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