431 views

### Is it possible to detect if everyting in the Universe is changing size? [duplicate]

This may be a trivial question, but I cannot find a good answer to it. What would happen if the size of everything in the Universe is multiplied by some constant factor at the same time, let's say ...
87 views

### Expansion of space or contracting of matter? [duplicate]

Can the expansion of the Universe effect be explained by contraction of the overall matter instead? That is, all material objects are in fact contracting, due to what the universal space seems (and ...
130 views

### What if humans doubled size… and everything else… could we notice? [duplicate]

After the big bang, everything expanded from a small mass. That expansion is said to be still happening. Imagine if everything observable constantly grew in size. EG. Everything slowly doubled in ...
44 views

### what if everything suddenly scaled up? [duplicate]

If every thing in the universe suddenly doubled in size, and the physical constants changed accordingly, would we notice any effects? if not, how can we possibly say if its not happening right now. ...
20 views

### Tempering of length and time [duplicate]

Suppose we are told that the linear size of everything in the universe has been doubled overnight. If we are told to measure the sizes, what will we do. I don't think we are going to measure ...
25k views

### Why does space expansion not expand matter?

I have looked at other questions on this site (e.g. "why does space expansion affect matter") but can't find the answer I am looking for. So here is my question: One often hears talk of space ...
1k views

### What if the size of the Universe doubled?

My question has a silly formulation, but I want to know if there is some sensible physical question buried in it: Suppose an exact copy of our Universe is made, but where spatial distances and sizes ...
563 views

### Is everything relative? Length and time?

Yesterday I woke up in the night after having a dream (after sleeping late watching a SciFi film on space). It had this: Suppose you are told that the linear size of everything in the universe has ...
138 views

### Thought experiments about $c$ [closed]

Poincare had a brilliant thought experiment about what if everything in the universe doubled in size, would anybody notice any difference or even be able to measure anything that can be compared with ...
203 views

### Universe expands … compared to what?

I keep hearing that universe expands. Since all is relative, the expansion must be relative to something. And since universe is all there is ... You got my point. The only points of reference are ...
98 views

### Is there an intrinsic speed of time? [closed]

If time and speed is relative, then we could double the speed of every particle in the universe, as this increases the clocks rate we shouldnt be able to tell any difference. But my question is, in ...