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By definiton, "dark" matter neither emits or absorbs light. Thus, it does not effect the brightness of galaxies.
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∙ 12y ago
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Where would you find visible energy and invisible matter in universe?
A good example of visible energy is found in the stars. An example of invisible matter is the "dark matter" that scientists believe surrounds galaxies. So, one answer to the question would be "in and around galaxies".
What 2 components are spiral galaxies made out of?
Stars, dust, gas, black holes, dark matter...By far the most significant component, in terms of mass, is dark matter, making up about 80-90% of a galaxy's mass.
What is dark matter state?
So far we aren't sure. In general, dark matter is a form of matter we cannot directly observe; its existence can only be inferred through gravitational interaction with baryonic "light" matter. Basically, Dark matter is stuff we can not see or detect but we think must be there. Because we can not see it capture it or even detect it, we do not know what is or consists of. However, we know enough about the universe to know that dark matter must consist of the same fine matter that atoms are made of. Dark Matter is the name scientists give to the "stuff" that we believe must be part of the known universe. Scientists can however observe and measure the affects of dark matter. Hear is how it works: We know that all objects made of matter generate gravity, like the sun the earth and the moon. Even a single person generates a small amount of gravity. The amount of gravity a planet or star produces is directly related to its mass, which is another way of saying or how much matter it is made of. The amount of gravity an object produces causes a very predictable orbit and speed. Sir Isac Newton gave us the exact mathematical formula for calculating how much mass an object in space has by measuring is orbit and speed. Here is the discovery: When scientists look through telescopes at distant galaxies as well as looking at our own galaxy they now have the ability to mostly add up the stars planets dust and the stuff we call normal matter. We should then be able to return to our telescopes and measure normal speeds at which the galaxies are spinning. What scientists discovered is that all the galaxies are spinning much much faster than expected. And they are not flying apart. Something is generating the extra gravity that is holding the galaxies together. For now because we we cannot see it, and light does not reflect off it, nor can we catch it or touch it, we call it DARK MATTER! Scientists believe it is mixed in with our own galaxy, and it makes up 95% of the known matter in the universe. Black Holes are another example of this type of thinking. We can not see or observe black holes because light can not escape them. One of the only reasons we know that they are there is because large stars spin around very powerful centers of enormous gravity only to be sucked in never to escape. We can not see black holes, but we can identify that a very large amount of mass is there by its affects on other objects. Dark matter helps explain the large-scale structures of the Universe such as superclusters and voids and why they exist. Dark matter is necessary for many mathematical equations to balance. If there is no such thing as dark matter, then many scientific theories do not make sense. Some scientists believe that dark matter exists everywhere, though it is not visible it is coexisting in dimensions all around us that we can not experience. In these discussions, there is a narrow line between Science and Belief. Answer2. "Dark Matter" is a missing actor in a Gravitational Play. Maybe we are observing an Electromagnetic Play, an Homopolar Motor! Maybe, nature uses Electromagnetism not Gravity to control the galactic stars motions. The energy E=mcV is the solution for the "Missing Matter " problem,. mcV is the energy providing the speed of stars in the galaxy.. The velocity is V = E/mc. This derives from the Electric Model of the galaxy, a homopolar Motor, , where the galaxy rotates as current comes in on the edge and Jets out of the center. Charged stars rotating create a B magnetic field perpendicular to the galaxy. In effect there is a mass spectrometer for stars. The equation is the Lorentz force F=qVxB = mv2/r giving velocity v= qrB/m = qruI/rm =quI/m=qzI/mc=E/mc! The velocity is independent of the radius r and dependent on the current I and the ratio q/m of the stars. The vector energy E=mcV is the "Dark Matter" of the Missing Matter in the galaxies and the "Dark Energy" of Gravitational Theory.
Why do astronomers theorize that there is dark energy in the universe?
There are several pieces of evidence for dark matter. For example: * Our galaxy, and many other galaxies, rotate way too fast for the amount of known matter. * Evidence from gravitational lensing.
Is dark matter the force?
Dark matter and The Force are not the same thing. The Force is a fictional power that connects all things. Dark matter is a real-world, theoretical matter that figures into physics and mathematics.
Why does the dark matter theory explain the decrease in brightness of spiral galaxies?
The decrease is caused because it makes the spiral galaxy move further apart.
Why do astronomers theorize that most of the matter in galaxies and clusters of galaxies is dark matter?
most of the mass in a cluster of galaxies is invisible, which provides astronomers with the strongest evidence that the universe contains a great amount of DARK MATTER
Why do astronomers theorize that most of matter in galaxies and clusters of galaxies is dark matter?
most of the mass in a cluster of galaxies is invisible, which provides astronomers with the strongest evidence that the universe contains a great amount of DARK MATTER
What has the author Robert Alexander Swaters written?
Robert Alexander Swaters has written: 'Dark matter in late-type dwarf galaxies' -- subject(s): Dissertations, Dwarf galaxies, Dark matter (Astronomy)
Does dark matter relate to a supernova?
Probably not. Dark matter is not believed to concentrate well in or around masses the size of stars. But it does concentrate well around galaxies and clusters of galaxies. Most of the mass of a galaxy like ours is believed to be in a sphere of dark matter in the galaxy's spherical halo.
Why do astronomers theorize that most of matter in galaxies and clusters is dark matter?
Dark matter may be invisible to light, but it can still be detected, through its gravitational interactions. Specifically, it can be detected: * By the fact that galaxies rotate way too fast, for the amount of known matter. * By gravitational lensing.
What makes up a universe?
About 68% is dark energy and 27% is dark matter. The remaining 5% is baryonic matter, which includes our Earth, the galaxies, and the contents of intergalactic space.
Why does the dark matter theory explain the brightness problem?
No light can excape what its caught in the black holes
Do black holes provide the physical force to structure galaxies?
No. The mass, and therefore the gravitation, of black holes, are only a tiny fraction of matter in the galaxies. The greatest part of the matter in a galaxy is dark matter - matter of unknown composition at the time of this writing.
Who found dark matter?
No one has discovered dark matter. Dark matter is a concept to explain the rotation of galaxies. We simply do not know what it is and where it is. When we looked at nearby spiral galaxies astronomers could not explain how individual stars could be moving so fast. If you add all the mass of the material we can see or infer the gravity should not be able to hold the stars in orbit. They should be streaming off. Dark matter was invented to explain this. The theory suggest that 60 to 90% of the matter in the galaxy needs to this strange dark matter.
Can dark matter affect seasons?
Dark matter has yet to be discovered or its properties fully understood
What evidence is there of existence of dark matter in the galaxies?
The motions indicate a greater gravitation pull than from what we see.
