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Just thought-experimenting.
If (as often happens) we represent 'spacetime' as a flat sheet (usually black rubber with white grid lines) and the distortion of spacetime by mass as a large ball sitting on the sheet, we can show the effect of gravity by rolling a smaller ball along the sheet, which will accelerate toward the large ball, and (ignoring friction) collide with or orbit.
So far so good.
In this model the flat sheet is suspended in 'nothing'.
But, what if you 'zoomed out' and the sheet was actually curved? Imagine it is sitting on a massive sphere.
If the sphere grows, so the 'universe' will expand.
Indeed if the sheet itself were like the skin of a massive rubber ball, then this effect would be observed if the ball was inflated.
So what we call 'dark energy' could simply be the inflation of whatever it is that 'supports' the universe.
The turtles are sliding down the side of the shell.
[^]
PooperPig - Coming Soon
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Human mind was created to enable us to survive on earth. To find food and mate for reproduction.
Explaining a concept beyond 3 dimensional space as "curved" is still using 3 dimensional concept.
God doesn't owe us a "how" answer in human words. Our brains are not ready.
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This is like a fish trying understand gravity. Maybe the fish would imagine it as constant invisible water flowing downwards. Because the fish brain is created so it can understand and survive underwater environment it does not have the brain pathway to understand dry land.
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Pete Zahir wrote: Human mind was created evolved to enable us to survive on earth.
ftfy
Pete Zahir wrote: Explaining a concept beyond 3 dimensional space as "curved" is still using 3 dimensional concept.
Because I don't have the language to describe curving through a 4th dimension, not beause something cannot. Think of it as an analogy.
Pete Zahir wrote: God doesn't owe us a "how" answer in human words.
What has 'god' got to do with it?
Pete Zahir wrote: Our brains are not ready.
speak for yourself
PooperPig - Coming Soon
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A curve requires 2 dimensions.
You could plot a curve across the x and y, or y and z, etc
If you read only a single axis coordinates (for instance assign all x values the same and read a curve's Y, it is indistinguishable from a line)
A curve involving the 4th dimension is this:
An object accelerating in a straight line.
Translate axis where X is the distance travelled and y,z =0
Time is experienced differently as it speeds thus the 4th dimension and curve
If you ignore the relativity changes in time, all you see is the straight ray on axis X
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Pete Zahir wrote: A curve requires 2 dimensions.
You could plot a curve across the x and y, or y and z, etc
You think you can't curve in 3 dimensions? Wow - how the heck did we ever get to the moon?!
Time is not the 4th dimension in question here. Time isn't really a dimension at all, except in sci fi movies and '4D Cinemas'
PooperPig - Coming Soon
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The earth/moon system is speeding around the sun at hundreds of thousands of km/h.
The speed and precision required to reach the moon without the earth/moon system disappearing into the distance must have been remarkable.
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Yes!
It's exactly the same precision that's involved in putting a cup down on a table without breaking the table, the cup, or your hand!
Isn't Physics wonderful!
I wanna be a eunuchs developer! Pass me a bread knife!
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Be nice. Calculus isn't included in computing courses.
I wanna be a eunuchs developer! Pass me a bread knife!
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Yes it is, computer engineering has calculus, physics, electronics, etc. A lot of it
To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson
Our heads are round so our thoughts can change direction - Francis Picabia
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Something after the weekend[^]?
Maxxx wrote: Time isn't really a dimension at all
Neither is x, y and z - they're just convenient mathematical abstractions ... just like r, θ and φ
- and I suppose you already knew that well enough ... 
I've been told our universe just sits in a valley ...
Espen Harlinn
Chief Architect - Powel AS
Projects promoting programming in "natural language" are intrinsically doomed to fail. Edsger W.Dijkstra
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I'm just impressed you worked out how to type greek letters
Espen Harlinn wrote: r, θ and φ
PooperPig - Coming Soon
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Maxxx wrote: I'm just impressed you worked out how to type greek letters
Ctrl+C, Ctrl+V 
Espen Harlinn
Chief Architect - Powel AS
Projects promoting programming in "natural language" are intrinsically doomed to fail. Edsger W.Dijkstra
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Cheat!
PooperPig - Coming Soon
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A curve is N dimensional.
modified 19-Jan-21 21:04pm.
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So does light travel in a ray or does it not
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Yes it doesn't. Or no it does. It's definitely one of those.
I am not a number. I am a ... no, wait!
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But a ray cannot deviate from a straight line. Light however can bend due to gravity. Someone has been lying but the question is who.
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Pete Zahir wrote: But a ray cannot deviate from a straight line.
Says who? If that's your a priori definition of ray then light doesn't travel in one. No contradiction. No lying.
I am not a number. I am a ... no, wait!
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I can prove it does deviate with a simple mirror, or prism... 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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There we have it!
Everyone take heed, because CP's expert on deviation hath spake.
I wanna be a eunuchs developer! Pass me a bread knife!
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I'll...um...take that as a complement?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Seriously?
Where did they teach you this stuff?
"Ray" is a descriptive word, used to describe what light looks like, to the human eye. It's not a "thing" in its own right, and it's not measurable (so it can't be used in any kind of calculation), even though it's used in grammatical structures that make it look determinant.
i.e. "a pound of sugar" and "a ray of light" might look the same, and give the impression that "ray" is determinant, but it's not. It doesn't matter how big or small a ray of light is, it's still just "a ray of light".
So you can't talk about rays as if they're separate from light. They are light -- or a non-unit-ish unit of light.
I wanna be a eunuchs developer! Pass me a bread knife!
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Mark_Wallace wrote: They are light
Search google for 'a ray of manure' ... you'll get a hit og two 
Espen Harlinn
Chief Architect - Powel AS
Projects promoting programming in "natural language" are intrinsically doomed to fail. Edsger W.Dijkstra
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Whoa, that's the gardening department. Might as well be Greek that's been google-translated to Hawaiian, for me.
Through that door, and talk to the missus.
I wanna be a eunuchs developer! Pass me a bread knife!
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