81–90 of 101 posts
If this fact makes you uneasy just know that 100% of the universe's galaxies, except the one we are currently in, are already unreachable within your lifetime.
Longevity escape velocity is achievable within our lifetimes.
If this fact makes you uneasy just know that 100% of the universe's galaxies, except the one we are currently in, are already unreachable within your lifetime.
Not with that attitude! Longevity escape velocity is achievable within our lifetimes.
Is there a galaxy on the boundary that is half disappeared (to us) and half visible?
Earlier quoted context omitted.
If this fact makes you uneasy just know that (nearly) 100% of the galaxy's solar systems except the one we're currently in are (likely) unreachable within your lifetime. Though to be fair, I think the original title can't possibly know this, for instance if we live in a simulation, what's to say that some sort of algorithm (assuming we learn to meta-code our own existence) could put us in any galaxy we choose... Or w…
If we're in a simulation then there aren't any alien civilizations. No sense wasting computational resources on them. P.S. As far as I know, computational complexity is the only physical quantity that doesn't obey conservation laws. So we're probably not in a simulation. If we were, it would probably be the other way around.
Earlier quoted context omitted.
Just to add to it: If you decided to travel to the furthest galaxies you could reach, at some point even they will move beyond the reach of Earth as space expands. To colonize them means to exile yourself from Earth permanently. Traveling through an infinitely expanding universe is like traveling into a permanent headwind in every direction.
Weird question I just thought of: if space is always expanding, why aren't the objects around us, even their very atoms, getting slowly torn apart? Are the forces holding them together just constantly pulling them back together? Is it just a very small amount of expansion at a human scale? Does this affect very sensitive measurements of distance?
Both. Even our galaxy is held together by gravity that's stronger than the expansion of space on that scale.
Since we can't ever reach most of the universe, that means we'll probably have to simulate it to ever explore it. Which means we're probably being simulated right now. Hm. Let's hope they left `sv_cheats` available.
If we're in a simulation...couldn't we learn to reprogram/hack the sim, and just put our spaceships in another galaxy?
Earlier quoted context omitted.
If this fact makes you uneasy just know that (nearly) 100% of the galaxy's solar systems except the one we're currently in are (likely) unreachable within your lifetime. Though to be fair, I think the original title can't possibly know this, for instance if we live in a simulation, what's to say that some sort of algorithm (assuming we learn to meta-code our own existence) could put us in any galaxy we choose... Or w…
If we're in a simulation then there aren't any alien civilizations. No sense wasting computational resources on them. P.S. As far as I know, computational complexity is the only physical quantity that doesn't obey conservation laws. So we're probably not in a simulation. If we were, it would probably be the other way around.
Seeing how mindbogglingly huge the universe is, our insignificant planet is unlikely to be the most intensive object to simulate. For a Universe simulator it would be peanuts, less than peanuts, peanut crumbs that fell behind the pantry where you can't clean them.
Earlier quoted context omitted.
The expansion of space doesn’t fall under that limitation. Spacetime isn’t a particle or collection of particles. It’s the gravitational field.
Space-time isn't a gravitational field. Gravitational fields curve space-time.
"I point out that the often voiced claim that in the general theory of relativity (GR) geometry and gravity are ‘associated’ with each other can be understood in three different ways. The geometric interpretation asserts that gravity can be reduced to spacetime geometry, the field interpretation claims that the geometry of spacetime can be reduced to the behaviour of gravitational fields, and the egalitarian interpretation affirms that gravity and spacetime geometry are conceptually identified."
https://www.sciencedirect.com/science/article/abs/pii/S18711....