I have no real knowledge of theoretical physics, I’ve just been thinking about the universe a lot recently and I have some thoughts that I’d love to hear someone who knows more about this stuff talk about.

Could the universe get both smaller and larger infinitely? If we were the size of a proton, our reality would be entirely different to what we experience now and we wouldn’t realise we were part of a wider macro world with life and nature etc. Could this be the case the other way? Could we be at a relative microscopic scale compared to another reality that we can’t perceive? I.e. if we were huge and the sun was the relative size of an atom to us, what would we see as we looked around?

Are there any theories around this kind of thing or is there a reason this isn’t feasible?

Assume that we found a way to accelerate to the speed of light, using that technology for travel would be pretty much useless outside our own solar system, because any interstellar travel would inherently have millions of years passing on Earth. So, in that time wouldn't we either have gone extinct in some way, or would we find a way to create/cause wormholes? Even if we populated other systems, this time passage would be an extreme issue causing certain colonies to die out and others to advance technology separately from others.

My 3 year old son recently got very into space and loves watching rocket launches. Where can we find news about upcoming launches and where is the best place to watch? We seem to keep missing the live launches and have to rewatch them on YouTube after. Thanks!

It's pretty clear that Starship will/is revolutionizing space travel, do you think that in the history books, Starship will go down as the little domino that changed everything for humanity? Kind of like how the Ford Model T symbolized the 20th century.

Ever been in a long tunnel in a car? I was in Boston going through one in my little old Honda and with the clutch in I was going 75 mph being pulled along with the draft of all the cars going the same way. This was decades before Hyperloop stuff and people talking about need for a vacuum - which I can see in a space launch but not Hyperloop since you're not going for Mach speeds. In either case, repeated use is going to get the air going very fast in one direction. Sending a big plug through on maglev would increase this and if the launch end was plugged I suppose the atmosphere could be rarified much. Yada yada, the point is that with a very long tube sloping upward to cooler, less dense air there's going to be effects happening that need to be explored in actual testing to get real engineering data.
I'd suggest Death Valley to Mount Whitney as a test site since dry hot air is below and plenty of sunshine and wind for power. Or the other side to get direction right. Probably a better place at equator maybe.

And the "it's too much g force for things" is crazy. If it works you can launch enough building stuff up into orbit to have repair shops for the others stuff. Whoever does it may end up sitting in a very lucrative spot. Of course the big problem is that the military and weapons corporations like sneaky sudden launch stuff with massive contracts using old technology and somehow we've let them be in charge of our most massive building projects. It takes a ladder to go over a trillion dollar wall so let's build a launch tube instead and find out real data so we can stop yapping and start learning.
Let Musk and Gore argue about whose idea it was.

https://apnews.com/article/china-space-moon-research-plan-5934ecd95ac9675d0ed367615f293b9c

I just watched a video on curved space and it got me wondering how would a 3D map of space look like if we draw the curvature lines on it. Would this even be possible?

Hello everyone! I'm looking for a livestream like this one (https://www.bilibili.com/video/BV11F41187J6/) from Tiangong station from 2024, can you help me?