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FawkesCa
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I didn't make this, but I think it's one of the coolest things ever.
http://www.newgrounds.com/portal/view/525347
enjoy
http://www.newgrounds.com/portal/view/525347
enjoy
Cool, a nice variation on the old Powers of Ten movie (itself an adaptation of the neat 1957 book Cosmic View which can be viewed here). I did notice one inaccuracy, though--due to the expansion of space, the size of the observable universe (i.e. the maximum distance some object, at rest relative to the microwave background, could be from us today and for it still be possible to us to today be receiving light from that object when it was younger) is much larger than 14 billion light years--see wikipedia's Observable universe article.FawkesCa said:I didn't make this, but I think it's one of the coolest things ever.
http://www.newgrounds.com/portal/view/525347
enjoy
Domain walls also do not have a center.unless they're talking about something like the idea of "domain walls" in inflationary theory
JesseM said:And saying "we're probably not at the center of the universe" in that final image would seem to be meaningless since even a finite universe isn't expected to have any outer boundaries to define a center...)
Diagrams like the one on http://www.damtp.cam.ac.uk/research/gr/public/cs_top.html seem to suggest the structure of the different domains is something like bubbles in foam, and each bubble has a center:haael said:Domain walls also do not have a center.
It's not that easy...Diagrams like the one on this page seem to suggest the structure of the different domains is something like bubbles in foam, and each bubble has a center:
Your picture looks like there was some universal time, common for all domains. This is not correct. In domains time flows "inside", that means near the wall the time is near 0 and in the center it is a big number. Actually, the point in the center of a domain corresponds to time infinity.There might be different ways to define the "center" of an irregular shape, but we could pick some simple definition, like the point inside the domain that has the largest distance to the closest point on the domain wall...
Maybe it is possible, but I think the line connecting two points from different domains would have to go through singular points, so it would be hard to define its length.can't we find the distance between any point inside the domain and any point on the domain wall?
Surely the rate that time "flows" can only be defined relative to some coordinate system? If so, what coordinate system are you using? Can you provide a link or other source that backs up what you're saying here?haael said:Your picture looks like there was some universal time, common for all domains. This is not correct. In domains time flows "inside", that means near the wall the time is near 0 and in the center it is a big number. Actually, the point in the center of a domain corresponds to time infinity.
Why does expansion imply "each point of it is equivalent"? As an analogy, successive spacelike cross-sections of a future light cone give a light sphere which is also expanding at the speed of light, but relative to any given inertial frame the light sphere does have a center (although there is no frame-independent definition of the center)haael said:Domain wall is not something static, it rather moves at the speed of light for any observer.
Also, each domain does expand, so each point of it is equivalent.
Domains expand in such a way, so each point is equivalent. There's no preferred point. There's no "closer" and "further" from any particular point to a domain wall. In fact, from the inside of domain point of view, the domain wall is in your past. You would have to go back in time to touch it. Digging deeper - the domain wall is the Big Bang itself, except in this theory the initial state of Universe has finite nonzero size.Why does expansion imply "each point of it is equivalent"?
You assume that you are in special relativity flat space. Domains expand in different way, more like cosmological inflation.As an analogy, successive spacelike cross-sections of a future light cone give a light sphere which is also expanding at the speed of light, but relative to any given inertial frame the light sphere does have a center (although there is no frame-independent definition of the center)
Sorry, I can't. It was too long ago. Perhaps it's time for me to shut up.Can you provide a link or other source that backs up what you're saying here?
The Scale of the Universe is a model that shows the relative sizes of objects in the universe, from the smallest particles to the largest known structures. It helps us understand the vastness and complexity of the universe.
The Scale of the Universe is typically measured in terms of distance, using units such as meters, kilometers, light years, and astronomical units. It can also be measured in terms of mass, with units such as grams, kilograms, and solar masses.
The smallest object on the Scale of the Universe is the Planck length, which is approximately 1.6 x 10^-35 meters. It is the smallest length that has any meaning in the universe, and is thought to be the scale at which quantum effects become significant.
The largest object on the Scale of the Universe is the observable universe, which has a diameter of approximately 93 billion light years. Beyond this, we cannot see because the light from those objects has not had enough time to reach us since the beginning of the universe.
The Scale of the Universe is important for scientists to understand because it helps us make sense of the vastness and complexity of the universe. It also allows us to study and compare objects on a wide range of scales, from subatomic particles to entire galaxies. This understanding helps us advance our knowledge and make new discoveries about the universe.