It looks like Big Shrink (BS) theory is easier to understand: we are shrinking, our rulers are shrinking, so cosmic distances are looking bigger in every direction. It explains why our Universe is flat and why we cannot find a Universe-big source of energy for expanding of the Universe.
This doesn't make sense either - if I were shrinking and you were shrinking, then the distance between us would appear to be growing larger, but it's not. Gravitationally bound systems don't expand, only the galaxies themselves seem to be moving away from one another. Combined with no mechanism to explain the shrinking, nor any reason why the various other laws of physics don't seem to be affected and it doesn't seem any easier to understand at all.
In this case, bound means that the force of gravity is stronger than the expansion of space time. All of space is expanding, but things that are close (ie within a few hundred thousand light years) pull on eachother enough to resist being swept away by the "current" and only distant galaxies recede. But it's not like there is something special about our position, if you could magically teleport to another galaxy a few billion lightyears away the picture would be about the same: your own galaxy and those nearby don't go flying apart, but all the distant galaxies do.
One complication is that since the universe is homogenous and infinite, there’s a boundary that is expanding away from us faster than the speed of light and this gravity as well.
The observable universe is of finite mass and size, while the total universe is of infinite or finite mass and size. On a macro scale, the total universe probably looks similar. It's definitely not micro homogeneous or entropy would be infinite and heat death would have already occurred. Heat death won't be the biggest problem because of the likelihood of the Big Rip.
> “The memory is nothing but the change in the gravitational potential,” said Thorne, “but it’s a relativistic gravitational potential.” The energy of a passing gravitational wave creates a change in the gravitational potential; that change in potential distorts space-time, even after the wave has passed.
Conservation of energy gets a bit screwy with these kinds of cosmic models. Partially because there isn't a single direction of 'time', but also because all kinds of energy gets stored in the fabric of space-time which can cancel out all kinds of things.
Not to mention that there's no reason to assume conservation of energy still holds if the laws of physics simply change over time (which would be the case in the simplest possible theory were all interaction distances simply shrink over time).
I don't get in many depictions they show this planet/ball over a grid that's deforming downwards. I can understand how another mass would want to "fall" into that but is it actually that shape (has up/down) or it some kind of sphere. I also believe with regard to mass clumping, gravity is strongest near the surface of the Earth vs. inside where you could say it's equal/0 except the oblique part.
The rubber sheet analogy is criticised for this exact reason. Here’s a different visualisation that starts with what’s wrong with the rubber sheet: https://youtu.be/wrwgIjBUYVc
That's a great video. 7:50 is the important twist for me, and 10:25 really drives it home. I'll never forget that video now and it explains so much.
THere's still one "flaw" with this video: explaining that the grid "moves" is a little confusing. It doesn't move per-se, it .. evolves? ... over time. That's weird. I keep wanting to think the curves are static, but from t0->tn the grid pinches up. Yes, that's why they call it spacetime, but I have to stop and reset myself because how can the grid keep pinching up indefinitely but it doesn't it is just a concept. That is a stumbling block. 35 years after my last physics class...lol.
That’s the best visualization of gravitation I’ve ever seen. Well done. I recommend it to anyone who’s been misled by the ubiquitous rubber sheet picture.
That's clever. I'd suggest an improvement. When a sat has initial speed, show its small local reference frame, so we'd see that it always moves forward in its own reference frame, but the frame happens to be pulled to Earth.
>Buy stock and benefit (or take a loss) with them.
Buy stocks, and explain to your children why they won't get to eat for the year to come.
It will pay off in the long run!
And if they starve to death, well, that's savings right there!
.... You do realize that millions — if not most people under 40 in the US — don't have spare money to invest into papers that they can't eat today, do you?
Rent, food, transportation, medical expenses, educational expenses, and a small amount of spending on something that makes that life feel like it's maybe worth living — and oops, there goes the paycheck.
Funny how the rent is larger than mortgage, but you can't get a mortgage unless you save money, but you can't save money because you have rent to pay.
And everyone who's working to make a living is one car accident away from a medical bankruptcy. A fun lottery nearly all of us get to play, funny that.
>Vote for such government
Yay, I voted, and FPTP ensured that meant nothing. I voted for ranked choice, but peculiarly, the vote for that was based on the same system that I was trying to replace.
>or immigrate to a socialists country, Venezuela or North Korea. They have the lot of jobs.
False dichotomy much?
And these are the only two countries in the world with universal healthcare and government providing housing and services to its citizens, I guess? Not Sweden, no? Not even the UK, or any EU country? Oh wait, nobody is waiting for me there.
But more importantly, what basis do you have for telling people what to do?
Especially when you tell someone to move to another country. How about... No.
What the parent commenter is doing, and what I'll do, is we'll be damn sure to talk about what the government should do in all public forums whenever the opportunity presents itself, to raise the awareness ans steer the public discourse in the direction we want our country to move into, rather than shutting up and moving if our vote gives us nothing this election cycle.
And we'll make it obviously, blatantly clear that opinions like the one you presented — ”vote or leave" — are rubbish.
Bad faith rubbish that doesn't belong on HN.
So I'll ask you to stop. My basis for that are the guidelines of this forum. We could do with less trash here.
For example, I raised some money from Alice, so I have obligation to pay $1M(+%) to Alice. In other words, Alice invested $1M into me. Now, my business grows, risks are reduced, so Bob paid $1.25M to Alice. Now, I have obligation to pay $1M(+%) to Bob instead of Alice.
Offshore companies are very popular in countries with unstable economy, like Russia, because oligarchs can confiscate your money at any time, so people in Russia are fighting with offshores with help of oligarchs. This is the real problem for them.
? Android is, AFAIK, completely permissively licensed except for the kernel, and KHTML/WebKit/Blink are BSD/LGPL; what would be special about them in this context?
