128

Get out I mean, literally. As in "get out of the universe". The heat death of our universe is by definition not a survivable event. That's the bad news. The good news is that it takes a very, very long time to happen. So a technological society has time to develop technological solutions to the problem. Some things that might work are: Cross over ...


98

No. By definition the heat death is the state where you could no longer do anything. Any actions you do before it only makes it come sooner. Best strategy: Sit still, do absolutely nothing. (I kinda like this strategy) For high-tech civilizations I recommend you put out the stars. They produce entropy really fast. In general, stop things from changing. ...


85

You do not. Period. I am not joking. This is the kind of thing science simply does not touch. Science is rooted in the world of empirical study. If you have a bubble where the laws of physics do not apply but appear to apply in every way shape or form, science simply will not detect this. A similar experiment is the brain-in-a-jar thought experiment: ...


85

No. Life on Earth and our solar system in general would not be harmed by this sudden universal destruction. Everything outside of the Solar system affects us via electromagnetic radiation, gravity, and "matter transfer". The EM radiation flux is too weak to really do much, other than marvel at through telescopes. With the rest of the universe gone we'd ...


79

Hard physics answer I think the question is fundamentally ill-posed. As long as there are humans alive somewhere, the universe is millions to the power of millions of years away from the "heat death" (which is not at all an agreed-upon or well-understood thing). The heat death (if we assume it is well-defined) is definitely not "when the last star fades ...


71

We wouldn't even notice for several years. The closest star to us (aside from the Sun) is Alpha Centauri, which is just over 4 light-years away. That means that whenever we look at Alpha Centauri from earth, we are seeing light that left the star over 4 years ago. If Alpha Centauri were extinguished today, we wouldn't even realize it until 4 years from now! ...


66

A few possibilities (bearing in mind that you can choose whatever you like): A WALL An impenetrable barrier, absolutely unyielding. A supernova won't scratch it, a black hole can't eat it, it's just a wall. That doesn't fit your model of physics? Tough, tell it to the wall. It may be glassy smooth and frictionless, and either perfectly flat or ...


59

You imply that mathematics is some fundamental root of the entire universe. While there are many who agree, this is not a fully agreed upon assumption. Many would say what you describe just any other world, only with different math, that looks feels and tastes just like this one, because mathematics is nothing more than a human construct. (as SJuan76 says ...


59

In physics mirror symmetry is called parity, so the question is whether any of the fundamental interactions depend on the parity. It turns out that the electromagnetic and strong interactions do not depend on the parity, but the weak force does. In fact parity is maximally violated by the weak interaction - only left handed particles and right handed ...


51

In short, a higher-dimensional entity does not "enter" a lower dimension, it passes through it. Consider a planar (two-dimensional) universe. If you or I were to interact with it, we could stick our fingers through it, with a cross-section of each finger intersecting that plane and existing within the planar universe at any given time, but we could never ...


49

First is the speed of light is not the speed of light, it is the speed of causality. PBS Space Time has a great video about this. Light goes at this speed because that's as fast as events are allowed to propagate in our universe. Make the speed of light infinite and now the speed of causality is infinite. This means events which happen here can affect ...


45

The main problem you're going to run into is that complete control of these forces would be, to put it bluntly, mad overpowered. Being able to control any of the forces, even the weak force, would make you a god of destruction. You said "no planet destroying abilities", which in my opinion is simply incongruous with having powers over these forces, ...


42

Frame challenge: It was not them who disappeared, it was us. What is more plausible (but still a twist in the laws of physics), that an entire universe vanished or that a single solar system in the outer rim of a galaxy vanished? (Occam's razor) It was not the Sol System that remained, it was the Sol System that was shifted to another, empty, reality. ...


40

Hack the Universe The universe is just a simulation running on a super computer somewhere. Exploit a bug so that you can get more energy/matter.


40

First people need to understand how relativity works. There's a thing called proper time which we regard as an interval between two events or points in spacetime. In "ordinary common sense" space you define the distance (the interval) like this : $$s^2 = (x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2$$ That's the square of the distance between two point. Time (and ...


38

It's impossible to stop it. There is nothing known in science that we can use to stop the heat death of the universe. There are no workarounds to avoiding the second law of thermodynamics. Many people have said it's impossible to violate the second law of thermodynamics (no free energy and no perpetual motion machines) and none of them were proved wrong in ...


36

I think the question implies a paradox that can't occur. The heat death of the universe is not when the last star goes out, it's when the universe reaches maximum entropy. By definition then, there's no way of 'surviving' the event, because you'd have to be dead in the first place for the condition to have been reached. Dead, decomposed and the energy you ...


36

Disclaimer Because my answer below throws a bit of shade at the other existing answers, and because I'm going for a bit of a flip, humorous, and somewhat defiant tone, I feel that I should point out that I'm a real life physicist and most certainly not a crackpot :-P Rant All the naysaying in the other existing answers, e.g. "This universe is ...


35

You're clearly not a time traveler First thing to know is that as far as we can tell, the number of universes is actually infinite, so the odds of returning exactly to the universe you left are exactly 0, but since there are an infinity of near-identical universes where a version of you left from, you can still find one that is indistinguishable (say the ...


28

The end of the universe would appear to be a wall of randomized radiation and charged particles. The universe is literally everything. So beyond that wall is nothingness. Visualizing nothingness is something that's hard for humans to do - in cinema and novels it's often portrayed as being grey/average, or incomprehensible. But we do have example of ...


27

A Pocket Dimension Scientists learn how to create pocket universes. Being a separate universe even if somewhat compact, it's time flows differently to the main universe and can be controlled. This means the inhabitants can be effectively frozen in time and sample the main universe once for a fraction of a second every billion years or so time is effectively ...


26

If God created the universe, and it’s 10,000 years old (in God’s inertial reference frame), then it only needs to be 20,000 light years across, centred on the solar system. The light that appears to come from further away could have been created, already in motion, at the same time as the rest of the universe.


26

Gravitational waves are the closest you will get to universe-shaking. Predicted by Einstein and proven in 2015, these waves are caused by colliding black holes that stretch the fabric of space-time. Unfortunately, that is the closest you will get to shaking the universe. These waves require extremely sensitive lasers stretching miles apart to detect. All ...


25

I think the second law of thermodynamics places too much emphasis on our universe existing as an isolated system. We've constantly pushed boundaries to find that there is another layer to unravel; The word for "atom" is derived from the Greek "atomos" meaning indivisible; but then we found protons, neutrons, and electrons (and eventually quarks). In the ...


23

This is just some speculation on a universe in which object with mass tend to accelerate $.001 \frac{m}{s^2}$ in every reference frame except its own. (You never move in your own reference frame!) To keep with Stack Exchange's "Short Answer" format (short when compared to peer-reviewed publications), I will not justify all claims made here. Such a universe ...


23

If the Grand Unification Theory is right, then there would be no atoms at all left in the universe by the time you have mentioned. This would occur due to proton decay. By this time probably all black holes would also have evaporated due to a phenomenon known as Hawking Radiation. Maybe even photons can decay into lighter particles. If these theories are ...


21

By proxy It would be terrifying to enter a 2d world. But we do it all the time in video games and it is fun, because we have a tech interface that interprets a 2d world in a way that make sense to us - the original DOOM is a fine example, or PacMan. A number of games attempt to render 4 spatial dimensions on the 2d monitor screen. The video game Braid ...


20

Parallel universes! (Disclaimer: My answer was inspired by Isaac Asimov's works. I myself have only a basic understanding of thermodynamics, so please excuse any mistakes, misconceptions or inaccuracies) Why not find a parallel universe where the laws of thermodynamics are different, or maybe the opposite, of our own, and then just "simply" ...


19

Let's build a universe. To describe this universe, we need a metric. I won't go into details about the precise definition - for more, see Wikipedia, as well as Physics and Mathematics. In this case, we need a metric of dimension (4 + 2) (i.e. four dimensions of space and two of time). This will be represented in a 6-by-6 matrix: $$g=\begin{bmatrix} g_{...


19

Depends on your exact definitions and assumptions. First you are assuming "heat death" as the Ultimate fate of the universe. There are other options. Secondly, the last star burning out is FAR from the heat death of the universe. 1014 years - last stars burning out 10100 years - last black hole's evaporate 101000 years - heat death The ratio between ...


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