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As technology has evolved, astronomers are able to look back in time to the moments just after the Big Bang. This might seem to imply that the entire universe lies within our view. But the size of the universe depends on a number of things, including its shape and expansion. Just how big is the universe? The truth is, scientists can't put a number on it.
The observable universe
Astronomers have measured the age of the universe to be approximately 13.8 billion years old. Because of the connection between distance and the speed of light, this means they can look at a region of space that lies 13.8 billion light-years away. Like a ship in the empty ocean, astronomers on Earth can turn their telescopes to peer 13.8 billion light-years in every direction, which puts Earth inside of an observable sphere with a radius of 13.8 billion light-years. The word "observable" is key; the sphere limits what scientists can see but not what is there.
But though the sphere appears almost 28 billion light-years in diameter, it is far larger. Scientists know that the universe is expanding. Thus, while scientists might see a spot that lay 13.8 billion light-years from Earth at the time of the Big Bang, the universe has continued to expand over its lifetime. Today, that same spot is 46 billion light-years away, making the diameter of the observable universe a sphere around 92 billion light-years. Centering a sphere on Earth's location in space might seem to put mankind in the center of the universe. However, like that same ship in the ocean, we cannot tell where we lie in the enormous span of the universe. Just because we cannot see land does not mean we are in the center of the ocean; just because we cannot see the edge of the universe does not mean we lie in the center of the universe.
The shape of the universe
The size of the universe depends a great deal on its shape. Scientists have predicted the possibility that the universe might be closed like a sphere, infinite and negatively curved like a saddle, or flat and infinite.
A finite universe has a finite size that can be measured; this would be the case in a closed spherical universe. But an infinite universe has no size by definition.
According to NASA, scientists know that the universe is flat with only about a 0.4 percent margin of error (as of 2013). A flat universe is an infinite universe; thus the size of the universe is infinite.
Will Science prove this correct?
originally posted by: Astyanax
a reply to: Phatdamage
Will Science prove this correct?
If you're speaking about the dimensions of the Universe and its expansion, these are observed facts; the task for science is to explain them. The apparent 'flatness' of space is almost a fact, too, though there is still a small possibility that the metric has inherent curvature. Again, the task for science is really to explain why this is so and how it came about.
originally posted by: Revolution9
a reply to: Phatdamage
These are good questions.
Personally I do not think the universe is any age that we can count. If the big bang happened and sent out information from which the matter of the universe originated then it must have travelled many times faster than the speed of light (how so?). Why, too, only in certain directions? Any explosion will send out particles in every direction unless an opposing force slows it down to any degree.
I don't think there was a big bang. I think the universe goes as far up and down as it does across, infinite in all directions. I think matter and the universe as infinite as each other (though matter could have a source of origin). The universe does not conform to human notions of beginnings and endings. Time, too, is as equally insignificant; no beginning and no end only an eternity of time and space. The information that swirls throughout I guess must have originated somewhere. How it appears to us and whatever originated it is as different as the results of a computer program and the code that formed it...perhaps, as multi dimensional in relationship, too!
originally posted by: Phatdamage
a reply to: TzarChasm
Exactly,
Science gave us UFO's, quantum processor computing, Modern Jet Engines and KFC!
originally posted by: Phatdamage
How is it possible for the observable universe to be 92 billion light-years wide while only being 13.7 billion years old?
This is an amazing question, and If the universe began as a singularity and is 13.8 billion years old, how can something be 46 billion light years away? Wouldn't that suggest that the universe expanded at a velocity greater than the speed of light?.......... but, i hear you say "That's impossible, as nothing can travel faster than the speed of light!!"
And if the universe is flat or has negative curvature then the Big Bang doesn't make much sense. How do you get infinite from something undefined? This has always bothered me. The universe to me cannot have negative curvature and defining it as being flat sounds stupid (the earth is flat idea), but if it is a closed universe, then the universe is massively huge. So much so that for what we can see, it looks flat. Like how the earth would look to an ant. A negatively curved universe can easily expand and would give us a limit as to how far back and away we can see before there is a horizon we cannot see past, like a ship on the ocean. (My head actually hurts now)
As technology has evolved, astronomers are able to look back in time to the moments just after the Big Bang. This might seem to imply that the entire universe lies within our view. But the size of the universe depends on a number of things, including its shape and expansion. Just how big is the universe? The truth is, scientists can't put a number on it.
The observable universe
Astronomers have measured the age of the universe to be approximately 13.8 billion years old. Because of the connection between distance and the speed of light, this means they can look at a region of space that lies 13.8 billion light-years away. Like a ship in the empty ocean, astronomers on Earth can turn their telescopes to peer 13.8 billion light-years in every direction, which puts Earth inside of an observable sphere with a radius of 13.8 billion light-years. The word "observable" is key; the sphere limits what scientists can see but not what is there.
But though the sphere appears almost 28 billion light-years in diameter, it is far larger. Scientists know that the universe is expanding. Thus, while scientists might see a spot that lay 13.8 billion light-years from Earth at the time of the Big Bang, the universe has continued to expand over its lifetime. Today, that same spot is 46 billion light-years away, making the diameter of the observable universe a sphere around 92 billion light-years. Centering a sphere on Earth's location in space might seem to put mankind in the center of the universe. However, like that same ship in the ocean, we cannot tell where we lie in the enormous span of the universe. Just because we cannot see land does not mean we are in the center of the ocean; just because we cannot see the edge of the universe does not mean we lie in the center of the universe.
The shape of the universe
The size of the universe depends a great deal on its shape. Scientists have predicted the possibility that the universe might be closed like a sphere, infinite and negatively curved like a saddle, or flat and infinite.
A finite universe has a finite size that can be measured; this would be the case in a closed spherical universe. But an infinite universe has no size by definition.
According to NASA, scientists know that the universe is flat with only about a 0.4 percent margin of error (as of 2013). A flat universe is an infinite universe; thus the size of the universe is infinite.
What do my fellow ATS people, think? do you believe there is any truth in this.....
Will Science prove this correct?
(Mind Blown....)
Source
originally posted by: RP2SticksOfDynamite
Answer the questions about U and you will have found the holy grail! U holds the key to all things! But I fear the answer is as far away as the U size!
The size of the human brain vs the size of the U. How on earth could the brain possibly ever truly understand the U!
Maybe the U is a Brain!
U knows!
originally posted by: Signals
It's all a fake, a hologram, the entire "universe." It's the most intricate simulation that will ever be observed. It only exits because we can observe it.
The real question is why are we here and how can we escape it.
It is not fact at all. Until the end of the universe and matter is found in two opposing directions then this can not be known. Humans have not found an ending in ANY direction as yet. It is a theory and a prediction, that is all.
originally posted by: greencmp
a reply to: Phatdamage
I believe you are referencing cosmic inflation which could explain both the rapid expansion as well as the relatively uniform distribution of matter in the universe.