nOOky
Diamond Member
- Aug 17, 2004
- 3,302
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Actually Chuck Norris has been outside the observable universe, many times, because he hates peeing indoors.
Actually Chuck Norris has been outside the observable universe, many times, because he hates peeing indoors.
hal2kilo
Lifer
- Feb 24, 2009
- 26,434
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This is an example of the state of physics and cosmology today. Which is just about pre Copernicus. Our maths tells us our observations must be correct, because we still don't really understand it physically just like we thought that the Sun revolved around the earth like the other planets. You just had to do some fudging with epicycles to get the retrograde planet movements right. Dark matter? Dark energy?
Hubble sees most distant star ever, 28 billion light-years away | CNN
The Hubble Space Telescope has glimpsed the most distant single star it's ever observed, glimmering 28 billion light-years away. The star, nicknamed Eardenel, could be between 50 to 500 times more massive than our sun, and millions of times brighter.www.cnn.com
How can a star be 28 billion light years away if it's light took 12.9 billion years to reach us?
Well that’s why JWST was designed. To look further back in the infrared beyond what Hubble can detect.
Paratus
Lifer
- Jun 4, 2004
- 17,737
- 16,049
- 146
Dark energy and dark matter are simply placeholders for effects we’ve observed but don’t understand yet.
Spiral galaxies hold together via gravity yet many have enough angular acceleration that based on the amount of observable matter they should fly apart due to not enough gravity. Therefore there is something we cannot see (‘dark’) that is acting like more gravity (‘matter’)
Same with the dark energy. We’ve observed the expansion of the universe increasing. Energy is required to make this happen yet we don’t see it where the energy is coming from: ‘dark energy’.
Hypotheses are currently being tested on both subjects.
cytg111
Lifer
- Mar 17, 2008
- 26,703
- 16,001
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Hubble sees most distant star ever, 28 billion light-years away | CNN
The Hubble Space Telescope has glimpsed the most distant single star it's ever observed, glimmering 28 billion light-years away. The star, nicknamed Eardenel, could be between 50 to 500 times more massive than our sun, and millions of times brighter.
How can a star be 28 billion light years away if it's light took 12.9 billion years to reach us?
Because the universe is cheating.
Apparently science has concluded that while nothing can travel faster than the speed of light, the MEDIUM (space time) that stuff travels in/on can expand(and contract I guess) at unlimited speeds.
I call it cheating.
woolfe9998
Lifer
- Apr 8, 2013
- 16,242
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Someone asked about how the "edge" of the universe is defined. It is defined by the end of spacetime. Spacetime is the "stuff" the universe is made of. It is expanding, or rather, stretching may be a better word. And it's carrying all the matter/energy along with it. The distant galaxies we see aren't really moving away, actually. The space in between them is growing larger.
This "expansion" is caused by something we do not understand that we're currently calling "dark energy." It works by stretching spacetime, the converse of gravity, which contracts spacetime. Locally, where matter is close together, gravity is stronger than dark energy. Hence the formation of galaxies, stars, planets, etc. But the spaces in between galaxies are far more vast than the galaxies themselves, so dark energy is stronger in those spaces, and galaxies insufficiently close for gravity to overcome dark energy, are moving apart.
There is only one galaxy, besides are few close small satellite galaxies, which is close enough to be moving towards us: Andromeda. It will collide with our galaxy in a billion or so years. All other galaxies in the universe are moving farther away.
The way the red shift works is, when electromagnetic radiation, i.e. what we call "light" and all wavelengths longer and shorter, moves through the universe, the dark energy that stretches spacetime is stretching the radiation along with it. Think of a string arranged as an up and down wave. What happens when you pull the string from both ends?
The frequency of the wave decreases, the wavelength increases, and the amplitude of each waves shortens. Hence, light shifts toward the red (low frequency) end of the spectrum as it moves through expanding space. Eventually it will be a radio wave, then nothing, once the "string" is pulled taught.
Light travelling short distances, however, through galaxies where gravity is stronger than dark energy, shifts towards the blue end of the spectrum.
This "expansion" is caused by something we do not understand that we're currently calling "dark energy." It works by stretching spacetime, the converse of gravity, which contracts spacetime. Locally, where matter is close together, gravity is stronger than dark energy. Hence the formation of galaxies, stars, planets, etc. But the spaces in between galaxies are far more vast than the galaxies themselves, so dark energy is stronger in those spaces, and galaxies insufficiently close for gravity to overcome dark energy, are moving apart.
There is only one galaxy, besides are few close small satellite galaxies, which is close enough to be moving towards us: Andromeda. It will collide with our galaxy in a billion or so years. All other galaxies in the universe are moving farther away.
The way the red shift works is, when electromagnetic radiation, i.e. what we call "light" and all wavelengths longer and shorter, moves through the universe, the dark energy that stretches spacetime is stretching the radiation along with it. Think of a string arranged as an up and down wave. What happens when you pull the string from both ends?
The frequency of the wave decreases, the wavelength increases, and the amplitude of each waves shortens. Hence, light shifts toward the red (low frequency) end of the spectrum as it moves through expanding space. Eventually it will be a radio wave, then nothing, once the "string" is pulled taught.
Light travelling short distances, however, through galaxies where gravity is stronger than dark energy, shifts towards the blue end of the spectrum.
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Be very afraid if “they” replied back with an accurate answer….Well... they found my star. About time. I couldn't imagine where the heck I misplaced it. Now, if they can just find my car keys.
Nah it will be like the 10 C in this season of Star Trek Discovery. They are significantly that much more advance they didn’t realize there was any intelligent life in the Milky Way.Be very afraid if “they” replied back with an accurate answer….
And one could argue that they’d still be within rounding of being correct in their estimates (of no intelligent life here…)
hal2kilo
Lifer
- Feb 24, 2009
- 26,434
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hal2kilo
Lifer
- Feb 24, 2009
- 26,434
- 12,564
- 136
An interesting comment in the forum where this was posted.
Classic physics is dead! But the ongoing funeral is exorbitantly expensive...
woolfe9998
Lifer
- Apr 8, 2013
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The article headline should have "particle" before "physics." This does nothing whatsoever to challenge general relativity, the governing theory for the large scale structure of the universe. Unless or until they can unify general relatively with quantum mechanics by identifying the mechanism of gravity at the quantum level, a change to one theory will not affect the other.
UNCjigga
Lifer
- Dec 12, 2000
- 25,666
- 10,386
- 136
Instantaneously if you use the magic shrooms for the mycelial network.
hal2kilo
Lifer
- Feb 24, 2009
- 26,434
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My only comment to that is that seeing Navy videos of things (tictacs) that are violating those laws has me in doubt.
woolfe9998
Lifer
- Apr 8, 2013
- 16,242
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General relativity is not being challenged by a tictac video, or whatever that is. I just watched it. It has been rigorously proven, with increasingly sophisticated technology over the years.
cytg111
Lifer
- Mar 17, 2008
- 26,703
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Yea, not long ago scientific consensus was that spacetime was either open closed or flat... then they agreed it was open (as in ever expanding) and now we got "The Big Rip" ... The big rip is when space time can stretch no more and it snaps... in like 22 billion years or so.
So yea. Give it another decade, shit will change again.
So yea. Give it another decade, shit will change again.
Regarding dark matter:
news.google.com
Google News
Comprehensive up-to-date news coverage, aggregated from sources all over the world by Google News.
news.google.com
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