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A balloon extends outward from a center though doesn't it...?
If we can observe stuff that 46.5 billion light years away, and were seeing that stuff as 46.5 billion years old, how can it be that they say the universe is only 14-15 billion years old...?That seems to be about right. There is no expansion within galactic groups, or clusters and within super clusters and filaments composed of super clusters. The expansion is within the voids that the filaments surround. The gravity that keeps clusters, super clusters and filaments together prevents space from expanding in those regions.
That doesn't mean that galaxies aren't sometimes moving apart or towards each other within those clusters, super clusters and filaments. For example the Andromeda galaxy is moving in our direction at approx 110 kilometres per second (68 mi/s) and will merge with our galaxy within 4.5 billion years, eventually forming perhaps a giant elliptical galaxy or a large disc galaxy. It only means that universal expansion is making the voids larger and distances between super cluster filaments greater.
Also, since we can't detect what lies beyond a certain distance, we don't know how much lagethe univers is than what we are detecting.
Visualization of the whole observable universe. The scale is such that the fine grains represent collections of large numbers of superclusters. The Virgo Supercluster – home of Milky Way – is marked at the center, but is too small to be seen.
Observable universe - Wikipedia
The yellow arrow points to the limits of what we can detect which is a diameter of(93 billion light-years. So we can observe 46.5 billion light-years in every direction. Everything beyond that horizon is unknown. The Earth is placed at the center of the diagram because that is our vantage point of observation. In other words, if we were in a location closer to the edge then the universe that we would be able to observe would be different one since the areas now undetectable would then be detectable and the areas now detectable would then be undectable.
That's because detectability depends on whether the light or radiation from those regions has had time to reach us or not. The light from regions beyond observation hasn't had time to reach us yet, and most will never reach us because at those distances space is expanding at or faster than the speed of light. In other words, the more the light travels the more space is added. Like being on a floor that keeps elongating as you run. So it makes little or no real headway.
I apologize for this, but I do not, or cannot see, how that answers my question though...? Could you elaborate possibly...?
How does it work in relation to normal matter...? What is it...? How does it work...? How is it different from dark matter...?
Is that what happens in a black hole, or not...? Is antimatter atoms...? Can they be seen like matter, or only detected in like particle accelerator's and such...?Leslie is correct that antimatter does show up in the lab, which is the key empirical difference between antimatter and dark matter.
As Leslie also correctly states, the polarity of antimatter is exactly the opposite of matter, and when the two types of particles meet, they annihilate into gamma rays and neutrinos.
No, it's a whole region uniformly expanding. Everything moves away from everything else. No center to the expansion.
What about the big bang theory then...? Doesn't it require a center...?
The definition of observable is kind of weird. At earlier stages things were closer. For very distant objects, light that we see now was emitted when the object was closer to us. So we can in principle detect objects that are now much further than 14 billions light-years because what we see now was emitted long ago when they were closer. Does that make sense?
So, they are probably farther away, and may be very different from what were seeing of them, right...? But how does that tie into the age of the universe...?
No. Remember, it's not an explosion. It's an expansion of space. Space is now uniformly expanding with no center. Run the movie backwards. Everything gets closer together. Go back far enough and it becomes very small.
