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binbots
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Does dark energy only affect space between galaxies? Or does it appear anywhere there is space? For example Between the Earth and the sun? Also on even smaller spaces like between a nucleus and an electron?
So there is dark energy everywhere, I mean like it's there between the our earth, sun , moon and all the other planets in our solar system but gravity prevents it from working or whatever it does? I take it there must have to be very little gravity, or better yet, no gravity at all, before dark energy manifests influence? What say about dark matter? Since very little is known about either dark energy or dark matter, could dark matter be dark energy that is gravity bound or are they both easily enough to detect and read to rule this out??Peace! P.S. I think I am going to have to go back to school because I only have half of my grade twelve in a Jethro Clamppet education which, in real world terms, equals a grade six, lol.e.bar.goum said:To reinterpret what Drakkith and Nabeshin said: Dark energy manifests itself everywhere (in that it is tied to space-time), but it only becomes effective at large scales.
korben dallas said:So there is dark energy everywhere, I mean like it's there between the our earth, sun , moon and all the other planets in our solar system but gravity prevents it from working or whatever it does? I take it there must have to be very little gravity, or better yet, no gravity at all, before dark energy manifests influence? What say about dark matter? Since very little is known about either dark energy or dark matter, could dark matter be dark energy that is gravity bound or are they both easily enough to detect and read to rule this out??Peace! P.S. I think I am going to have to go back to school because I only have half of my grade twelve in a Jethro Clamppet education which, in real world terms, equals a grade six, lol.
korben dallas said:So there is dark energy everywhere, I mean like it's there between the our earth, sun , moon and all the other planets in our solar system but gravity prevents it from working or whatever it does? I take it there must have to be very little gravity, or better yet, no gravity at all, before dark energy manifests influence? What say about dark matter? Since very little is known about either dark energy or dark matter, could dark matter be dark energy that is gravity bound or are they both easily enough to detect and read to rule this out??Peace!
binbots said:Thanks everyone. So dark energy is everywhere but you can only notice it when there is little to no gravity around. Got it. I am still curious how this force works though. Let’s take the Earth for example. If it wasn’t for gravity dark energy would rip all the atoms of the Earth apart, correct?
But can it also not be seen as a force that keeps the Earth together? If you could draw arrows to show direction of force could all the arrows be pointing towards the earth? Almost as if it wants to crush all matter. You can imagine it like bubbles in water. All the water pushes on the bubble which in turn gives the bubble its sphere shape, just like all the planets and stars in space. If you picture it in this manner you don’t even need gravity. Dark energy keeps things together and the other 3 forces keep them apart.
binbots said:Thanks everyone. So dark energy is everywhere but you can only notice it when there is little to no gravity around. Got it. I am still curious how this force works though. Let’s take the Earth for example. If it wasn’t for gravity dark energy would rip all the atoms of the Earth apart, correct?
binbots said:But can it also not be seen as a force that keeps the Earth together? If you could draw arrows to show direction of force could all the arrows be pointing towards the earth? Almost as if it wants to crush all matter. You can imagine it like bubbles in water. All the water pushes on the bubble which in turn gives the bubble its sphere shape, just like all the planets and stars in space. If you picture it in this manner you don’t even need gravity. Dark energy keeps things together and the other 3 forces keep them apart.
binbots said:So if it expands in all directions from every point would that not mean that every point that surrounds our planet be expanding, but they will also be expanding in the direction of the earth. Almost as if matter is trapped in expanding space. Sorry if these are stupid questions, I just find it really weird that such a powerful thing like dark energy does not play a bigger role in the creation of the universe.
binbots said:So if it expands in all directions from every point would that not mean that every point that surrounds our planet be expanding, but they will also be expanding in the direction of the earth. Almost as if matter is trapped in expanding space. Sorry if these are stupid questions, I just find it really weird that such a powerful thing like dark energy does not play a bigger role in the creation of the universe.
binbots said:So the space in the Earth is also expanding. Thanks, I always wondered about that. Weird how gravity seems like such a weak force but it is able to resist this expansion that is taking place everywhere, all the time and is getting faster.
e.bar.goum said:But gravity isn't resisting the expansion!
Remember, it's energy intrinsic to space, not something gravitational forces interact with.
Drakkith said:I'm not certain but I think that might be arguable. I think I remember a post about whether space is expanding within galaxies or whether it is suppressed because of gravity and only expands once the density of mass in the area is low enough.
e.bar.goum said:But gravity isn't resisting the expansion!
Remember, it's energy intrinsic to space, not something gravitational forces interact with.
twofish-quant said:I don't think this is right. In the Einstein equations, dark energy is just a constant pressure term, but in gravitationally bound objects it's balanced out by the stress-energy tensor term.
e.bar.goum said:I was deliberately conflating dark energy and the cosmological constant term since they seemed to be being used interchangeably (and seems to be used interchangeably in lay discussions everywhere at the moment) and I didn't want to introduce more confusion. My cosmology lecturer wouldn't approve.
twofish-quant said:I worry that the explanation that dark energy is "energy that appears as space expands" is going to be one of those "almost but not quite correct" explanations that people will regret in a few years (like the metaphor that things "gain mass" as they get close to the speed of light).
Chronos said:Under the 'big rip' scenario dark energy will eventually overcome even atomic bonds. But, it appears we still have trillions of years before that becomes as worrisome as global economic trends.
binbots said:So I am still confused. Does the expansion of space have any effect on matter or gravity? On any scale?
binbots said:Does this mean that the Earth itself is actually expanding aswell?
Drakkith said:Every point everywhere, including inside the Earth would be expanding.
And who says it hasn't played a role in the universe? It is responsible for the accelerating expansion, I'd say that's quite a big role, even if it might not have played a big role in the early universe.
Tea Jay said:If every point, including inside the earth, were expanding, would the Earth be expanding as well? I'm assuming that due to the presence of gravity, etc, that we would not be able to measure this, but if the "fabric with the grid we're all drawn on" is expanding, that should include everything.
Everything except matter expands!Tea Jay said:If every point, including inside the earth, were expanding, would the Earth be expanding as well? I'm assuming that due to the presence of gravity, etc, that we would not be able to measure this, but if the "fabric with the grid we're all drawn on" is expanding, that should include everything.
If the graph paper we are using for the analogy is drawn onto spacetime fabric, that has grids that are governed by local gravitational forces for example, as opposed to a logarithmic or linear rule, etc - Then the grid is influenced by all of the involved factors...but perhaps approaching zero impact for the Earth itself.
So, the impression I have is that the effect is universal, but the scale of the impact is highly variable.
Dark energy is a hypothetical form of energy that is believed to make up about 70% of the total energy in the universe. It is thought to be responsible for the observed accelerated expansion of the universe.
Dark energy is believed to have a uniform distribution throughout all of space. This means that it affects the expansion of the universe in every direction and at every point in space.
Currently, dark energy cannot be directly detected or observed. However, its effects can be measured through its influence on the expansion of the universe and the distribution of galaxies.
No, dark energy and dark matter are two different concepts. Dark matter is believed to make up about 27% of the total energy in the universe and is responsible for the gravitational effects on galaxies and galaxy clusters. Dark energy, on the other hand, is thought to be a form of energy that is causing the accelerated expansion of the universe.
Dark energy is still a mystery and is not fully understood. However, it is a crucial component in the standard model of cosmology, which describes the evolution and structure of the universe. Its presence is necessary to explain the observed accelerated expansion of the universe and its effects on the distribution of galaxies.