what is the percentage of black matter in the universe?
611919
depends on who you ask, you could probably find all percentages because we are not capable of measuring black matter throughout the whole universe.
453562
We don't (as yet) know what dark matter is composed of. It certainly is *not* ordinary matter since it is known not to be composed of baryons (like protons and neutrons). While neutrinos are certainly *part* of the dark matter, there are not enough of them to account for all the dark matter we know exists. Other suggestions are particles called axions, but nothing is certain in this regard.
401680
The theory of dark matter has been developed to try and explain the observed characteristics of large-scale celestial objects, like galaxies. Mass (matter) causes gravity which in turn effects the shape and motions of things like spiral galaxies. However, the observed shape and motions of spiral galaxies can't be explained by the amount of matter known to be there. Some other kind of matter must be present, and that's called "dark matter."\n\nDon't confuse "dark matter" with "dark energy." The latter is another mysterious feature of the universe that is thought to be causing the expansion rate of the universe to be increasing.\n\nHere's the theorized percentages of dark matter, dark energy, and regular matter for the universe --\nDark matter.....23%\nDark energy.....73%\nRegular matter..4%\n\nYou could almost say that 97% of the universe appears to be missing :)
1021193
No idea what you mean by your comment.....\n\nIn cosmology, dark matter refers to matter  of yet unknown composition, that does not emit or reflect enough light to be detected directly. But its presence may be inferred from gravitational effects on visible matter such as stars and galaxies. \n\nEvidence suggest that there is much more dark matter than visible matter. As it is non-interacting with light it must be of non-baryonic origin. It also must be stable, because it exists since the Big Bang, 14 billion years ago. The only candidate among the elementary particles we know already are the neutrinos. However there are theories like Supersymmetry that predict other particles, that would fit the known data.
28023
The observable universe is estimated to contain:\n10^11 galaxies, 10^21 stars, and 10^78 atoms.\n\nThe means 100,000,000,000 galaxies.
69147
So far science doesn't know what so-called dark matter is. Dark matter is the name for some exotic type of mass that is required to explain the motions of large structures in space, like galaxies, clusters of galaxies, etc.,. At this time, we think that dark matter accounts for about 23% of the universe's mass, while regular matter can only account for about 4%. The remaining 73% is thought to be what's called 'dark energy,' the totally unknown feature that is causing the universe's expansion rate to speed up.
391370
Not really, a solid is usually atoms packed closely enough together so that they bond and form a structure that is resistant to change. Blackhole cores are of collapsed matter: there are no atoms, protons or even quarks. Just like plasma isn't "gas," blackhole material isn't solid
37854
Estimates are between 10^22 to 10^24 for the universe.\nhttp://www.esa.int/esaSC/SEM75BS1VED_extreme_0.html\nFrom the site in the source -\nLike the number of grains of sand on the beach or angels that can dance on the head of a pin, the number of stars in the sky remains a great unknown. Discussing the number of stars in the Milky Way alone, astronomer William Keel, writing for the sci.astro Galaxies FAQ, claims that there are "about as many as the number of hamburgers sold by McDonald's."\n\nThen he elaborates. The usual way to determine the number of stars in the universe is to consider how many stars there are in the Milky Way, and then to multiply that number by our best guesstimate at the number of galaxies in the universe. This FAQ suggests there are probably about 400 billion stars in the Milky Way, although "a 50% error either way is quite plausible." As for the number of galaxies in the universe, well that's a whole separate mathematical puzzle.\n\nOther star enumerators we located on the Web offer numbers ranging from more than 200 billion stars in our galaxy to 3 thousand million billion stars (3 followed by 16 zeroes), in the universe. NASA alleges there are zillions of uncountable stars.\n\nFrom a recent astronomy news article on CNN.com, we learned about the Sloan Digital Sky Survey, an ambitious astronomy project currently mapping the night sky, to determine the "positions and absolute brightnesses of more than 100 million celestial objects."\n\nSo stay tuned, the star count is still out.
67361
At least 100 billion galaxies are known to exist in the Universe. Our galaxy is a spiral one, so in terms of structure it consists of galactic core and several spiral arms. In terms of composition it includes stars, planets (made from regular matter, including atoms of all naturally occurring elements and ions), galactic gas and dust (made from regular matter, mostly hydrogen and helium as far as the gas goes, and hydrogen, carbon, silicon, oxygen and some other elements as far as the dust goes), dark matter and dark energy (there is little known about the last two).
641972
Photons.\n\nThere are about 10^9 photons for every nucleon in the universe.
572071
Stephen Hawking addressed this issue in his famous book " A Brief History of Time" .\n\nHe stated that if the universe continued to expand the density of matter will continue to decrease with a resulting drop in the average temperature of the universe.\n\nHe feels that eventually, ( as in billions of years ), the only things left in such a large and cold universe will be black holes which will "gobbled up" nearly every atom of matter and energy so that it will be a very dark place.\n\nin fact the real endpoint of the universe is unknown, and it may eventually contract as well if there is enough gravity to pull it back together !
1022451
I got 85% in physics last term.I am pretty good at the subject.I will try my best to help you if only you can frame the question.
590743
The most interesting fact I know?  That they don't exist and that they're some stupid idea somebody came up with to help explain a few things we don't currently understand.  Singularities have infinitely dense mass?  Riiiight.\n\nYou'd better start reading up on the Electric Universe, buddy.  There are powerful magnetic fields all over the Universe, and the stupid idiot "scientists" running the show right now don't like to acknowledge that maybe there are electric currents shaping our galaxies.
476348
Ask your friend if he knows about "dark matter". \n\nAlmost all the astronomers and most of the physiscists believe nowadays that only 4% of the Universe is made of "normal matter", that is made of neutrons, protons, electrons, photosn, etc (all the aprticles contained in the standard model of Particle Physics). The rest of the Universe is believed to be made of something whose nature is still not known, 26% of this "something" is called dark matter, the name is because it doesn't interact via electromagnetism, therefore, it can not produce, or be affected by light of any frecuency, it is then dark in the sense that no instrument based on light can detect it. The presence of dark matter however affects massive bodies by its gravitational influence, in the last decades its existence has been inferred in objects of very large size, like galaxies and cluster of galaxies, there are many indirect observations that sustain the existence of dark matter, the most stronger is probably the observed rotation curves fo galaxies, which doesn't match the expectations if we account only the visible ("normal") matter.\n\nCandidates for being the components of dark matter are beyond the Standard Model of Particles, going for supersymmetry to more exotic stuff like branes and extra dimmensions. It is a very interesting fields and many projects are currently being carried pout to discover it directly or know more about its nature indirectly.\n\nThe remaininf 70% of the Universe is even a bigger mistery, it is called "dark energy". It differs of dark amtter because contrary to it, it doesn't produce an atraction like the gravitational force, but a repulsion in the large scale Universe, so it is not the same as dark matter, and of course, not the same as normal matter, it is something else, there are theories that try to describe it, but we are still in the beggining of discovering what it is.
224500
Wikipedia claims that the observable universe contains about 7 × 1022 stars, organized in about 100 billion galaxies, which themselves form clusters and superclusters. An Ask the Scientist response to this question claimed that there are about 10 billion (10^10) stars in an average galaxy, \nand there are about 10 billion galaxies that we can observe in the universe, so the answer is 100 billion billion or 10^20. I don't think it is an issue that we have a precise answer for as yet.
891624
i'm not sure how you consider it mathematically unlikely - where's your working for that?\n\nThe theory is that yes, the matter in the universe can from the dense plasma that expanded from the singularity that began the big bang.  Howver, if dark matter theory is to be believed, there is a lot of matter unaccounted for - but it is still likely to have originated from the Big Bang
583603
im pretty sure its 80%. I reda it on the back of a libra pad lol