Ennara
Ennara t1_j1e1akv wrote
Reply to comment by a4mula in Can we truly know the age of the universe? by Geodad478
>the space between galaxies is expanding at a rate that is faster than the speed of light. However, it is important to note that this expansion is not a violation of the laws of physics, as it does not involve the movement of matter or energy through space.
Oh god, this breaks my brain. The amount of space between galaxies is expanding, but the galaxies themselves aren't moving as a result of the expanded space between them? I'm not saying you're wrong, but god dang I can't wrap my head around how that's actually possible.
The only vaguely coherent thing I can think of is like... a piece of taffy, where the two galaxies are sitting on the edges and you stretch the middle downwards. So the amount of space the taffy occupies increases, but the galaxies don't actually move. But I don't think that's accurate, because if space between us and a distant galaxy is expanding, then the distance increases which it doesn't in the taffy explanation... And I'm back where I started.
Ennara t1_j1e40x2 wrote
Reply to comment by a4mula in Can we truly know the age of the universe? by Geodad478
Yeah, I sort of get that, I think at the core of it all I'm just having trouble wrapping my head around the concept of increasing the amount of space between two objects without moving them. Using the cake analogy, I'm finding it difficult to understand how the air molecules move in such a way to take up more space without pushing the things that already occupy that space out of the way. I can accept that they are based on the studies and testimony by people far smarter than I am, but my brain is pitching a fit because I'm struggling to grasp the 'how.'