If Universe Is Expanding, Why Aren't We?
It's tough to wrap your head around four dimensions. Scientists have known that the universe expands since the 1930s, but whether we expand along with it is still one of the questions I am asked most frequently. The less self-conscious simply inform me that the universe doesn't expand but everything in it shrinks because how could we tell the difference?The best answer to these questions is, as usual, a lot of math. But it's hard to find a decent answer online that is not a pile of equations, so here's a conceptual take on it.