Dark Energy

Dutch Uncle said:
While I'm familiar with the concepts, that doesn't mean I understand them. LOL

How does dark energy negate the theory of gravity or alter it? Because it appears to be massless?
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Dark energy is weird, because our conventional theories of gravity imply the expansion of the universe should be slowing down.

Scientists were shocked, beginning in the 1990s, to observe that the expansion of the universe is inexplicably speeding up - accelerating. This has been independently verified by numerous research groups.

The catch-all term to describe this weird acceleration of the universes' expansion is Dark Energy.
 
Cypress said:
Dark energy is weird, because our conventional theories of gravity imply the expansion of the universe should be slowing down.

Scientists were shocked, beginning in the 1990s, to observe that the expansion of the universe is inexplicably speeding up - accelerating. This has been independently verified by numerous research groups.

The catch-all term to describe this weird acceleration of the universes' expansion is Dark Energy.
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The X factor. Didn't you post that visible matter only makes up about 15% of the entire Universe? The rest is labeled "Dark Matter" because no one knows what it is.

What are we missing?
 
Dutch Uncle said:
The X factor. Didn't you post that visible matter only makes up about 15% of the entire Universe? The rest is labeled "Dark Matter" because no one knows what it is.

What are we missing?
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The estimates I have seen for the proportions of "stuff" in the universe are 5 percent conventional matter and energy, 20 percent dark matter, and 70 percent dark energy.

So, at this time we only have the ability to observe or detect about 5 percent of the "stuff" in the universe.
 
Cypress said:
The estimates I have seen for the proportions of "stuff" in the universe are 5 percent conventional matter and energy, 20 percent dark matter, and 70 percent dark energy.

So, at this time we only have the ability to observe or detect about 5 percent of the "stuff" in the universe.
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Thanks!

So we only understand 5% of the Universe and the other 95% is a mystery. How awesome is that?
Looks like the human race, if it survives, has a lot of homework and research to do. :)
 
Dutch Uncle said:
Thanks!

So we only understand 5% of the Universe and the other 95% is a mystery. How awesome is that?
Looks like the human race, if it survives, has a lot of homework and research to do. :)
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That's what makes science fun:all the mystery to be explored.

I think a lot of people have the impression science has figured out about 80 percent of everything.

I think that is our hubris manifesting itself. It is impossible to quantity, but maybe we only have ten percent of it all figured out!
 
Cypress said:
That's what makes science fun:all the mystery to be explored.

I think a lot of people have the impression science has figured out about 80 percent of everything.

I think that is our hubris manifesting itself. It is impossible to quantity, but maybe we only have ten percent of it all figured out!
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If you ask Trump, he understands 100% of everything. :thup:

The lack of humility in people has done many great things and many bad things. Overall, the results must be good because there are more of them constantly learning more and going further than at any time in known history.

Not bad for a species that was once on the verge of extinction. Part skill, part luck. The story of my life. Same for you?

https://www.npr.org/sections/krulwi...ings-almost-vanished-from-earth-in-70-000-b-c
How Human Beings Almost Vanished From Earth In 70,000 B.C.
Well, we've waxed. So we can wane. Let's just hope we wane gently. Because once in our history, the world-wide population of human beings skidded so sharply we were down to roughly a thousand reproductive adults. One study says we hit as low as 40.

Forty? Come on, that can't be right. Well, the technical term is 40 "breeding pairs" (children not included). More likely there was a drastic dip and then 5,000 to 10,000 bedraggled Homo sapiens struggled together in pitiful little clumps hunting and gathering for thousands of years until, in the late Stone Age, we humans began to recover. But for a time there, says science writer Sam Kean, "We damn near went extinct."
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Dutch Uncle said:
If you ask Trump, he understands 100% of everything. :thup:

The lack of humility in people has done many great things and many bad things. Overall, the results must be good because there are more of them constantly learning more and going further than at any time in known history.

Not bad for a species that was once on the verge of extinction. Part skill, part luck. The story of my life. Same for you?

https://www.npr.org/sections/krulwi...ings-almost-vanished-from-earth-in-70-000-b-c
How Human Beings Almost Vanished From Earth In 70,000 B.C.
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Yeah! I heard about this near extinction of humans! Supposedly, there were only a few dozen left, which may explain our low genetic diversity compared to many other species.


I really don't know if there is an objective way to measure achievement, but I would guestimate that my life experience is about 90 percent attributable to parents, family, environment, fortune, community, and about ten percent due to individual effort.
 
Cypress said:
Yeah! I heard about this near extinction of humans! Supposedly, there were only a few dozen left, which may explain our low genetic diversity compared to many other species.


I really don't know if there is an objective way to measure achievement, but I would guestimate that my life experience is about 90 percent attributable to parents, family, environment, fortune, community, and about ten percent due to individual effort.
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I think that's the future after the Apocalypse,a few survivors here and there around the global.
 
BidenPresident said:
Never heard of that.
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Considering that many people assume there is probably a scientific explanation for almost everything, I don't think my guestimate is too far off.

Hubris is a human flaw. At the end of the 19th century, the consensus among physicists was that we were nearing the end of physics; we had pretty much figured everything out and there were just loose ends to tie up.

But then Einstein, Bohr, Schroedinger rocked their world.
 
Cypress said:
Considering that many people assume there is probably a scientific explanation for almost everything, I don't think my guestimate is too far off.

Hubris is a human flaw. At the end of the 19th century, the consensus among physicists was that we were nearing the end of physics; we had pretty much figured everything out and there were just loose ends to tie up.

But then Einstein, Bohr, Schroedinger rocked their world.
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I suspect most people don't care about science at all. About the same who don't really care about politics.
 
Cypress said:
Yeah! I heard about this near extinction of humans! Supposedly, there were only a few dozen left, which may explain our low genetic diversity compared to many other species.


I really don't know if there is an objective way to measure achievement, but I would guestimate that my life experience is about 90 percent attributable to parents, family, environment, fortune, community, and about ten percent due to individual effort.
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I’d weight more on the individual.

One way to separate individual effort and parental/mentor influence is to look at siblings. If you’re the one who is successful and the rest are back home working minimum wage jobs, then clearly yours would be more individual effort. If all were successful, then obviously there are external factors contributing to success.

That gets into a Nature vs. Nurture, genetics vs environment.
 
Dutch Uncle said:
I’d weight more on the individual.

One way to separate individual effort and parental/mentor influence is to look at siblings. If you’re the one who is successful and the rest are back home working minimum wage jobs, then clearly yours would be more individual effort. If all were successful, then obviously there are external factors contributing to success.

That gets into a Nature vs. Nurture, genetics vs environment.
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Everyone in my immediate family and my first cousins are/were college graduates, or accomplished professionals. No one worked for minimum wage as an adult.

I had extraordinary parents, but I also think there is a latent expectation in immigrant families to take advantage of the gift you were given.
 
Cypress said:
Everyone in my immediate family and my first cousins are/were college graduates, or accomplished professionals. No one worked for minimum wage as an adult.

I had extraordinary parents, but I also think there is a latent expectation in immigrant families to take advantage of the gift you were given.
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Kudos to your parents.

Humble people never take anything for granted. Egocentric, arrogant people not so much. Which is why they whine louder when things go to shit on them.

Notice when they start blaming others for their problems as a key indicator.

Since most human beings are almost identical genetically, the major differences are purely cultural. Environment. Home life. Upbringing.

JPP is a skewed sample but the people we all meet in everyday life are good examples of average.
 
BidenPresident said:
I suspect most people don't care about science at all. About the same who don't really care about politics.
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Agreed.

OTOH, I would a lot more care about politics because 1) they're too fucking stupid to understand science and 2) anyone who has an opinion falling out of their ass is a politician.

My professional background is technical but my education is a mix of science and liberals arts (behavioral psychology, PolSci: Intl Rel). I lean hard toward science and tech even if I don't understand it all...which doesn't matter since I'm a decent pilot who doesn't know how to build an airplane. LOL

What is your background, BP?
 
BidenPresident said:
I suspect most people don't care about science at all. About the same who don't really care about politics.
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I think it is true that many people do not have a personal interest in science, but culturally we tend to be acclimated to the idea that most all questions and problems have a scientific solution.

In my experience, it is not until people are in their 50s and 60s that direct personal experience informs them that doctors and medical science is more guesswork and art work, and that precise scientific answers and solutions are often beyond our grasp.
 
Cypress said:
I think it is true that many people do not have a personal interest in science, but culturally we tend to be acclimated to the idea that most all questions and problems have a scientific solution.

In my experience, it is not until people are in their 50s and 60s that direct personal experience informs them that doctors and medical science is more guesswork and art work, and that precise scientific answers and solutions are often beyond our grasp.
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Okay, don't agree.
 
Dutch Uncle said:
Agreed.

OTOH, I would a lot more care about politics because 1) they're too fucking stupid to understand science and 2) anyone who has an opinion falling out of their ass is a politician.

My professional background is technical but my education is a mix of science and liberals arts (behavioral psychology, PolSci: Intl Rel). I lean hard toward science and tech even if I don't understand it all...which doesn't matter since I'm a decent pilot who doesn't know how to build an airplane. LOL

What is your background, BP?
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I majored in math for my BA. I have 2 graduate degrees.
 
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