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Melodie Ann
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I would like to know the difference between dark energy and dark matter. The way i understand it they are both detected by the effect the have on other ojbects. So why are they different?
Thanks
Thanks
Well, everything is detected by the effect it has on other objects.Melodie Ann said:I would like to know the difference between dark energy and dark matter. The way i understand it they are both detected by the effect the have on other ojbects. So why are they different?
Thanks
Well, you would have to provide evidence that dark matter and dark energy are the same thing. Lacking that evidence, we assume they are different until it is shown otherwise. What has been observed of them are two distinct, different, and contrary effects: attraction in the case of dark matter, and repulsion in the case of dark energy.Melodie Ann said:Thank you for responding, but my question still remains. I realize it it believed that dark matter is believed for keeping things in their place. But why could not the same thing be said for dark matter also causing other things ie the universe to expand?
There is certainly something to dark matter, I never said otherwise. Scientists are trying to figure out how it fits into the Standard Model of known particles.There must be something to it or why would a group of scientists be working in an abandoned mine 2500 or so feet underground trying to catch dark matter.
Melodie Ann said:Thank you for responding, but my question still remains. I realize it it believed that dark matter is believed for keeping things in their place. But why could not the same thing be said for dark matter also causing other things ie the universe to expand? There must be something to it or why would a group of scientists be working in an abandoned mine 2500 or so feet underground trying to catch dark matter. Isn't the universe wonderful.
Thanks again
Melodie Ann said:I would like to know the difference between dark energy and dark matter. The way i understand it they are both detected by the effect the have on other ojbects. So why are they different?
Thanks
tiklu123 said:you see,dark matter IS matter.actually, dkm is an elusive particle called the neutrino.vast quantittttttttttttttttes of it was produced during the big bang. it is responsible for holding galaxies together.it creates gravity,on the other hand,dark energy is the mysterious enrgy caused by the continual production and destruction of matter-antimatter pairs.it is responsible for accelerating the rate of expansion of the universe.it acts opposite to gravity.got it!
Melodie Ann said:To use the word nonsensical in any matter regarding science is inappropriate. Galliao said the Earth revolved around the sun and was kicked out of the church and placed under house arrest for the rest of his life. Guess what he was right. We and our science are infants in the universe. We know little and have very much to learn. No theory is silly or whatever until there is absolute proof. An open mind and questions are the best ways to learn. Thanks again for the input.
That doesn't make sense.Melodie Ann said:To use the word nonsensical in any matter regarding science is inappropriate.
There's no such thing as absolute proof in science. But there's a plethora of silly theories in fringe science.No theory is silly or whatever until there is absolute proof.
Melodie Ann said:Thank you for responding, but my question still remains. I realize it it believed that dark matter is believed for keeping things in their place. But why could not the same thing be said for dark matter also causing other things ie the universe to expand? There must be something to it or why would a group of scientists be working in an abandoned mine 2500 or so feet underground trying to catch dark matter. Isn't the universe wonderful.
Thanks again
foxawy said:i meant if dark matter is the souce of gravitational forces does this mean that it is the gravitons. what i want to ask is the mediators of electromagnetism are photons but the source is electrons ,is it that the same relation with gravity is it sourced by dark matter with gravitons as mediators.
Redbelly98 said:There is certainly something to dark matter, I never said otherwise.
Redbelly98 said:Scientists are trying to figure out how it fits into the Standard Model of known particles.
Parlyne said:Dark matter is absolutely, positively, demonstrably not neutrinos. Neutrinos are extraordinarily light and this prevents them from being bound gravitationally to systems that aren't extremely large, given that the overall temperature of the universe is, and always has been, non-zero. Put simply, they aren't massive to have created the large-scale structure of the universe at the time we know it existed. Dark matter is something else.
Additionally, dark matter doesn't "create" gravity any more than electrons create electromagnetism. Electrons are a source of electromagnetic forces and dark matter is a source of gravitational forces.
niceboar said:It's not just neutrinos but http://astro.berkeley.edu/~mwhite/darkmatter/hdm.html
Neutrinos are probably a type of it though.
Parlyne said:The problem is that the EM field equations are linear, allowing superpositions of different solutions, while the Einstein field equations of GR are highly non-linear.
I didn't say neutrinos made up most of the dark matter in the universe, simply they are a type of dark matter.twofish-quant said:Hot dark matter was one of those good ideas that turned out to be wrong. Also that page is somewhat out of date. As we are getting more and more data, the possible amount of hot matter in the universe has dropped to the point that it's not significant.
There are a lot of different forms of "dark matter." But the dark matter that makes up most of the universe just can't be neutrinos as we currently understand them.
Parlyne said:Dark matter is absolutely, positively, demonstrably not neutrinos.
Dark energy is a theoretical form of energy that is believed to make up about 68% of the total energy in the universe. It is thought to be responsible for the accelerated expansion of the universe.
Dark matter is a theoretical form of matter that is believed to make up about 27% of the total mass in the universe. It does not interact with light and is therefore invisible, making it difficult to detect.
Dark energy and dark matter are different in terms of their properties and effects. Dark energy is a form of energy that is thought to be responsible for the expansion of the universe, while dark matter is a form of matter that is believed to make up a significant portion of the total mass in the universe.
Scientists study dark energy and dark matter through various methods, such as observing the effects of their gravitational pull on visible matter and using advanced telescopes and detectors to try to directly detect them.
There are several theories about the origins of dark energy and dark matter, but they are still largely unknown. Some theories suggest that dark energy is a property of space itself, while others propose that dark matter is made up of new, yet to be discovered particles.