It has nothing to do with boundaries.
Space itself is expanding.
Strictly speaking, the galaxies are not flying away from each other. It is the space itself between them that is expanding.
Dark Energy
- Thread starter Cypress
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It has nothing to do with boundaries.
Space itself is expanding.
Strictly speaking, the galaxies are not flying away from each other. It is the space itself between them that is expanding.
Into the Night
Verified User
WTF??? That doesn't even make sense!
A cubic meter of air is still a cubic meter of air. What is expanding?
How does one measure the expansion of something that has no known boundaries?
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Melchizedek = Michael
Verified User
Expansion happens when using a bong.
Of course it doesn't make sense to you, because you haven't invested the time and education to try to grasp it. Your mind is stuck on 7th grade level understanding of Euclidean geometry and volume.
The universe is not expanding into anything, the way a balloon would expands into the air around it. It is the empty space itself between galaxies which is expanding. The galaxies themselves are not literally flying away from each other.
Sure there are boundaries to the observable universe. It is approximately 46 billion light years across.
The question we don't have an answer to is what, if anything, lies beyond the observable universe.
Dutch Uncle
* Tertia Optio * Defend the Constitution
By the particles within it. The common example I remember is a raisin bread; as the bread rises in baking the raisins all move apart. By looking in several directions at galaxies they mostly seen as moving away from our own.
https://www.loc.gov/everyday-myster...mean-when-they-say-the-universe-is-expanding/
https://dbuweb.dbu.edu/dbu/GEOL1401/PPT2011/Ch24/img35.html
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/hubble.html
https://www.jpl.nasa.gov/edu/teach/activity/math-of-the-expanding-universe/
Into the Night
Verified User
Into the Night
Verified User
Grasp what? Your nonsense??
So now you deny Euclidean geometry. Gotit.
The universe has no known boundaries. A balloon defines a boundary (of the contents of a balloon).
How does one measure the expansion of something that has no known boundaries?
Some are. Are you aware of the concept of red shift?
Which means nothing in this context. Straw man fallacy.
About 93 billion, actually. In some directions of observation it is considerably less.
Correct.
So... How does one measure the expansion of something that has no known boundaries?
Into the Night
Verified User
Bread has a boundary. The universe doesn't have any known boundary.
Our limits of observation have a boundary. The universe has no known boundaries.
So explain how something without any known boundaries can expand.
The elastic band has a boundary.
Any instrumentation, including the Hubble telescope, does not answer my question. You are evading.
How does one measure the expansion of something with no known boundary?
You asked how something with no boundaries could expand.
I replied that boundaries have nothing to do with it.
It is the empty space between galaxies which is itself expanding.
Expansion of the universe is estimated by measuring the wavelengths of light reaching us from different galaxies. Wavelengths are stretched, or red shifted, the faster they are moving away from us. There is some kind of mathematical modeling involved.
You should enroll in an introductory cosmology course if you want learn about this stuff.
Dutch Uncle
* Tertia Optio * Defend the Constitution
No worries. You get it. I get it. Sybil doesn't get it. What's wrong with this picture?
No worries. You get it. I get it. Sybil doesn't get it. What's wrong with this picture?
I feel like we should be charging him tuition fees at this point.
Dutch Uncle
* Tertia Optio * Defend the Constitution
LOL. Usually I ignore him unless he starts harassing me then I harass back.
Into the Night
Verified User
That's right. You can't seem to answer this question without going into nonsense.
If there are no boundaries, how can you describe an expansion?
How do you measure the expansion of something that has no known boundaries?
A couple of galaxies is not the universe.
No mathematical modelling required. Red shift is a normal effect of the wave properties of light.
Assume I never took one. How does one measure the expansion of something that has no known boundaries?
Into the Night
Verified User
Can't answer the question, eh? You just want to troll and insult people. Guess that's all you know how to do.
Into the Night
Verified User
Lie. Trolling. You spend almost every one of your posts throwing insults at people.
Dutch Uncle
* Tertia Optio * Defend the Constitution
What's wrong with this picture, Sybil? Since you always fail to answer my other questions, I'm not holding my breath that you'll be able to answer this one either, kiddo.
Dutch Uncle
* Tertia Optio * Defend the Constitution
I doubt it's a matter of cost since the answer is easily obtained by Googling "The Expanding Universe Theory" as previously discussed. A wealth of factual information for those interested. Anything from a reputable science, educational or government groups can provide the basics...for those sane and interested enough to look.
Example: https://www.space.com/52-the-expanding-universe-from-the-big-bang-to-today.html
Our expanding universe: Age, history & other facts
The evolution and content of our ballooning universe
EXPANDING UNIVERSE
In the 1920s, astronomer Edwin Hubble discovered the universe was not static. Rather, it was expanding; a find that revealed the universe was apparently born in a Big Bang.
After that, it was long thought the gravity of matter in the universe was certain to slow the expansion of the universe. Then, in 1998, the Hubble Space Telescope's observations of very distant supernovae revealed that a long time ago, the universe was expanding more slowly than it is today. In other words, the expansion of the universe was not slowing due to gravity, but instead inexplicably was accelerating. The name for the unknown force driving this accelerating expansion is dark energy, and it remains one of the greatest mysteries in science.
Into the Night
Verified User
Google is not a source. It's an indexing system.
You still cannot answer. You are quite a job tapdancing around it and evading, but the question still remains.
How can you measure the expansion of something that has no known boundaries?
So what caused the so-called 'Big Bang'? Is that something outside the universe? If that's true, the 'Big Bang' is not about the universe.
Why does the Universe have to have a beginning?
How to measure the expansion of something that has no known boundaries?
This isn't science. It's religion. Indeed there are many fundamentalists in this religion that try to prove it True.
Science is a set of falsifiable theories. The Theory of the Big Bang is not falsifiable. Science has NO theories about past unobserved events.
Dutch Uncle
* Tertia Optio * Defend the Constitution
Awesome, dude. Have you considered taking your act on the road?