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Why does the dark matter theory explain the decrease in brightness of spiral galaxies?
Wiki User
∙ 8y ago
The decrease is caused because it makes the spiral galaxy move further apart.
Wiki User
∙ 8y ago
Wiki User
∙ 8y agoI never heard about dark matter explaining a decrease in brightness. It does explain quite a few other things, though - for example, the anomalous rotation of the galaxy.
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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.
How does the traditional theory of the formation of the galaxy explain the origin of globular clusters?
Cluster's form because gravity gradually builds a center of mass which over time accumulates more and more matter which can explain the formation of galaxies as well as globular clusters.
In a chemical reaction does the amount of matter increase or decrease?
Niether; matter cannot be created (increase in matter) nor destroyed (decrease in matter) following the Law of Conservation of Matter.
Do all galaxies have gravity?
Yes..where there is matter there is gravitational force..!
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.
Does dark matter affect the brightness of galaxies?
By definiton, "dark" matter neither emits or absorbs light. Thus, it does not effect the brightness of galaxies.
Why does the dark matter theory explain the brightness problem?
No light can excape what its caught in the black holes
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.
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 is galaxies formation?
Galaxies formed from dust, matter, and energy that formed from the explosion of the universe.
What type of galaxy is the dimmest?
There are galaxies that orbit our galaxy that are believed to be filled with a lot of dark matter. Segue 1 is one of about two dozen dwarf galaxies around ours that have light outputs equal to only a few hundred times that of our sun. There are probably untold numbers of other such galaxies around the more visible galaxies. This is a possible explanation for the discrepancy in the predicted mass of the universe and the observed mass. Some theories postulate that 90% of the mass of the universe is composed of this unobservable "dark matter". The existence of these dim dwarf galaxies help explain the discrepancy.
How does the traditional theory of the formation of the galaxy explain the origin of globular clusters?
Cluster's form because gravity gradually builds a center of mass which over time accumulates more and more matter which can explain the formation of galaxies as well as globular clusters.
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.
In a chemical reaction does the amount of matter increase or decrease?
Niether; matter cannot be created (increase in matter) nor destroyed (decrease in matter) following the Law of Conservation of Matter.
Do all galaxies have gravity?
Yes..where there is matter there is gravitational force..!
How do you know dark matter exists?
In the absolute strictness sense, neither I nor anyone else can know dark matter exists. But we DO know that neither the measured velocities of spinning galaxies nor the bending of light from distant galaxies can be explained (1) by the amount of matter we can see in and between those galaxies (2) with our present understanding of gravity. Either there's some mass out there that we can't see OR we don't understand gravity as well as we think we do. Conceptually, scientists prefer solving these discrepencies with (1), as it means we simply have to add some matter to our Universe. What EVER that extra matter happens to end up being, we will, until we know better, simply call it "dark" matter. Thus, ANY use of solution (1) means dark matter exists, even if we don't know its exact nature. Interestingly, the density of dark matter that would explain the first anamoly -- the spin velocity of galaxies -- is about equal to the density that would explain the second one -- the bending of light through inter-galactic space. This strongly suggests solution (1) for both unresolved problems.
