Why is the existence of dark matter believed, and used to explain extreme gravitational effects, when........?

Question

they can be explained by the presence of black holes instead?

AwesomeBi - But the reason the universe is believed to contain a certain amount of mass is because of observable gravitational effect. If thats the only reason, then black holes could account for that.

Answer 1

You might be right however I guess we do not need dark matter. It has been invented to explain why far objects move apart accelerated. This is a wrong concept by believing the redshift can be explained only by Doppler effect. When we also accept Compton effect, then there is no acceleration at the 'borders' of the universe.

Answer 2

Can they?

Extreme gravitational effects are not only related to the amount of mass, but also to the distribution of mass. Black holes have their mass concentrated in a small part of space, whereas dark matter would allow for large masses spread out more or less evenly over space.

Answer 3

There is no correlation between black holes and dark matter. The universe is believed to have to contain a certain amount of mass that is unaccounted for. It's still a young theory, but scientists are confident that dark matter is the missing ingredient. The name is a catch-all name until it can be better identified.

Answer 4

Black holes can be found by lots of X-Rays. I think because of the matter falling into them being excellerated and squished. There are lots of regions in space where no X-Rays are found but the stars do funny things ... like disappear for a while and the orbits of things are out of wack. So astronomers and astrophysicist hypothosize that "Dark Matter" must exist and cause the gravitational affects and mask the light of the stars passing behind it.

Answer 5

First to get rid of some misinformation fed to you --

"...dark matter is another name for anti matter..." This is WRONG!

If black holes were responsible for the observed shape and motion of most spiral galaxies then there would be some evidence of black holes being there, like concentrations of high-energy radiation (yes, such energies can be observed at vast distances where many spiral galaxies lie). No such concentrations have been found around any of the studied spiral galaxies.

Answer 6

Cite?

Answer 7

The universe is not expanding as quickly as the predictions would suggest unless we add dark matter to the equation. Black holes do not work for this.

Dark matter is simply matter that we cannot see any hint of. It is neither black holes themselves, nor is it antimatter.

Answer 8

I think it is because the parts of the universe (that can't be seen) that are dark due to mass/solid which has absorbed the energy around that area.. hence the darkness, and the gravity which still exists there.

Answer 9

dark matters in space r mainly dead stars have such a molecular compactness that even light cannot pass through it .


and due to extrweme compactness it gravitational force is uncompareable.

Answer 10

dark matter is another name for anti matter. and not only does it exist. but on earth we are creating it. all it is is matter that has its negatively charged and positively charged particles switch charges. when it contacts normal matter it explodes.