What's Beyond the Universe? Question Analysis

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SUMMARY

This discussion centers on the philosophical and scientific inquiries regarding the nature of the universe, specifically addressing questions about what lies beyond it, the concept of time, and the possibility of time travel. Participants argue that if the universe is finite, it does not necessarily imply the existence of an external space, challenging the notion of boundaries and edges. The conversation also explores the idea that time may be a human construct, with implications for the feasibility of time travel. Key references include the book "Physics of the Impossible" by Michio Kaku, which discusses manipulating time through motion and gravity.

PREREQUISITES
  • Understanding of general relativity and its implications on space-time.
  • Familiarity with the concepts of finite versus infinite universes.
  • Basic knowledge of philosophical arguments regarding existence and boundaries.
  • Awareness of time dilation effects near massive bodies, such as black holes.
NEXT STEPS
  • Research "General Relativity and the Nature of Space-Time" to deepen understanding of cosmological models.
  • Explore "Time Dilation and Its Implications in Physics" for insights into time manipulation.
  • Read "Physics of the Impossible" by Michio Kaku for a comprehensive view on theoretical physics and time travel.
  • Investigate "Finite and Infinite Universes" to grasp the mathematical models of universe boundaries.
USEFUL FOR

Philosophers, physicists, cosmologists, and anyone interested in the fundamental questions of existence, the nature of time, and the structure of the universe.

  • #31
TalonD said:
and to think, we used to believe the Earth was flat and if you traveled far enough you would fall off the edge...

I have always found that people have a difficult time wraping the grey matter around the concept of 'nothingness'. Perhaps 'infinity' can be just as difficult. But when you stop trying to picture things in your mind and just accept the concept then it becomes easier with things that are so counter intuitive.

Since the subject of time was brought up...

I have a question or lots of questions about time. So help me understand it a bit. I know that it is considered a dimension which is somewhat interchangeable with the other 3 dimensions of space from GR. so that by changeing the speed at which you move through space, you change your position in time relative to a stationary observer. but... I can imagine a universe which contains no matter or energy, would there be a such thing as time in that uninverse? are we required to have motion in order to have time? If so then is there an equivilance of time and motion or of time and energy, and if so then could time be considered to have a wave particle duality? could we envision some experiment where time waves could be detected?


...if there is gray matter, is there gray energy? jk ;)

Get it out of your head that time is some THING. In order for time to exist it simply needs to be acknowledge, it's what we use to measure, it's just as good as a ruler, and nothing more, if you have no concept of time, then there is no time, simple events.
 
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  • #32
Aquw said:
Question 1- what's beyond the Universe?

If the universe if finite, there must be something outside it, right? I've heard many people say "it's just time- and no space", but how can this be?

Well, the way that i see this is that If, the universe is finite then a location of this space must exist, i.e. your house on the planet, you can't hold a location of space if there isn't sufficient space in which to hold it, thus the universe is finite in which it is held in a location, but this location in which holds the prior location of the location must always be finite and therefore the universe must be finite which, logically is impossible (i.e. you MUST have space to hold space). assuming the universe is infinite, you would need to assume that an infinite amount of space exists to hold the infinite(or continuously expanding) universe, which also will turn up impossible (this is all assuming that the universe isn't just a "4-D" Space-time continuum which many theories suggest - which seems slightly un-real, but the only possibility) so in turn there is nothing beyond the universe, for the universe doesn't exist at all. :frown: which obviously it does, but think about it. :confused:


-- Grog
 
  • #33
There is an old saying that sems apt to many of the posts on this forum and I am no exception. " a wise man knows not, and knows that he knows not. A fool knows not and knows not that he knows not"

and oh by the way, time is a real thing as much as any of the other three spatial dimensions.

nuf said
 

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