The photon has zero rest mass.
As the above fact, and its consequences, has been in textbooks for many decades I can't quite see in what sense your question has not been answered. If you are seeking a different answer which you find intuitively acceptable then that is a different question to which there may be no answer.
Thanks for that DF96. Crystal clear!
Not sure what you mean by "this stuff". If you mean modern physics then I guess that just tells us that you have trouble believing anything you don't understand, and you don't understand anything which you find counter-intuitive.Jimmy154 said:It's just crazy to me people believe this stuff and for no other reason other than other people believe in it too.
Not sure what a "bobble-head" is. If you are suggesting temporal snobbery, then that is more common among people who don't understand stuff. People who do understand know how hard was the road to that degree of understanding, so they are not surprised that people in the past had different ideas and people in the future will also have different ideas - although we hope that their ideas will include our ideas as a limiting case (just as modern physics includes but does not replace classical physics).You know something?
And you're not going to believe this, but someday this day will be the past (probably) and bobble-heads will look back at this time thinking people were complete idiots that knew nothing.
(just as modern physics includes but does not replace classical physics).
Plato's 'discovery' of the atom I think was a stunning leap forward
So what about the notion that whatever it's expanding into, it's expanding from here? And we are not moving but static in space. I mean our solar system as a whole. All roads lead to us...or from us.
So what about the notion that whatever it's expanding into, it's expanding from here? And we are not moving but static in space. I mean our solar system as a whole. All roads lead to us...or from us.
I would guess that's true, but only because it's the same all over.
I think all space is expanding, at a greater rate than where it has matter to drag along with it.
So what about the notion that whatever it's expanding into, it's expanding from here? And we are not moving but static in space. I mean our solar system as a whole. All roads lead to us...or from us.
We are not static in space, we only think we are since there is no way to measure or know. Regarding space expanding, it is expanding everywhere and everything is getting more distant from everything else. How could that be? We don't know exactly, but we can measure that it's happening. In other words, for example, all galaxies are getting more distant from all other galaxies, since the space in between them is expanding.
It isn't expanding into anything, since from the perspective of this Universe there is nothing "outside" of it. As best as we can understand it, at the moment of the Big Bang the Universe was a singularity with infinite density and zero size. What wasn't in the singularity at the start and the expanding and inflating and expanding Universe after that wasn't this Universe and the concept that there was space outside is a misconception, since it was inaccessible from the perspective of this Universe it isn't space. Because mass curves spacetime the space in the Universe is closed as the mass in the Universe curves space around it. If you tried to fly in a straght line "away from the Universe" you would be following a closed path that could not leave the Universe...so there is no there, there. It's intrinsically wierd and apparently our evolved in 3 dimensions of space and 1 of time minds aren't really capable of visualizing or having intuitive insight beyond those particular dimensions. We can do the math that apparently governs N-dimesional spaces but getting a picture in your mind of it...not so much.
So, since the universe has nothing to compare itself to, it is in essence still a singularity, and space/time is an illusion of consciousness?
(All of the above excluding the chance of bubble universes).
(All of the above excluding the chance of bubble universes).
Where is the evidence? I mean that 'we' are not stationary?I would guess that's true, but only because it's the same all over.
I think all space is expanding, at a greater rate than where it has matter to drag along with it.
Where is the evidence? I mean that 'we' are not stationary?
Stationary compared to what? We are in a solar system in the Milky Way galaxy way out on one of the spiral arms. Somewhere around the middle of the galaxy is probably a supermassive black hole providing a lot of the gravity to hold the galaxy together. Maybe more than one black hole. Since black hole(s) at the center of galaxies tend to be extremely massive, the galaxies tend to rotate around them.
Why would someone think a massive black hole and the rest of a galaxy would rotate around one little low-mass planet in one little solar system at the outer edge of the galaxy?
Where is the evidence? I mean that 'we' are not stationary?
Redshift as found by Hubble (the astronomer not the telescope, although the telescope extended the confirmation) that increases with distance in all directions, meaning the farther away a body is in the Universe the faster it is moving away from us. The reasonable man would then not presume Earth is in some privileged center position and the only explanation is Universal expansion.
Could it be that everything in the universe is shrinking instead? After all it came from nothing in the first place 🙄
The earth IS at the center - of what we can observe. We have not found one edge closer to us than any of the others. Therefore it can arbitrarily be considered the center until there is new data on the true extents.
There supposedly was a city on the edge of forever, but I believe Kirk said "Lets get the hell out of here" when he found it....
There supposedly was a city on the edge of forever, but I believe Kirk said "Lets get the hell out of here" when he found it....
Could it be that everything in the universe is shrinking instead? After all it came from nothing in the first place 🙄
You have to wait some (was it 80b more years?) - eventually it will, and everything will come crashing into a... big bang. And on it goes... this cycle is the only true infinity that exists.
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