Dark matter

Dark Matter is hypothesised to exist because it produces effects that appear to be the result of mass where no such mass can be seen. Therefore it can be indirectly 'detected' by these effects.

C is the answer, but I can't see why B is wrong.

THANKS

Oh, so dark matter CAN be detected from observations of its effects, making B be wrong, so C is right, right?

Thanks

you can observe it, because basically when scientists look at the stars in the galaxies - the force (which keeps the stars in the galaxy) they calculate from the matter they can see, is not enough to actually keep them there, which suggests that there is more matter that they cannot see. So it can be detected due to the fact that they can calculate the force required, and therefore they can work out how much dark matter is present.

So C is right. Dark matter does not give off light or another other form of radiation.

you can observe it, because basically when scientists look at the stars in the galaxies - the force (which keeps the stars in the galaxy) they calculate from the matter they can see, is not enough to actually keep them there, which suggests that there is more matter that they cannot see. So it can be detected due to the fact that they can calculate the force required, and therefore they can work out how much dark matter is present. (...)

Do I have this right that the galaxy with all the stars and other celestial bodies are keep by visible matter and unvisible (dark) matter? so the whole existence - the existence of the earth included - depends on these matters alone?

(...) Energy at the big bang turned into mass (by Einsteins E=mc^2 equation) forming the subatomic particles and everything else. Both dark matter and matter were formed from this energy. (...)

(..)
Our whole existence isn't exactly down to these matter. Our existence is down to energy. Energy at the big bang turned into mass (by Einsteins E=mc^2 equation) forming the subatomic particles and everything else. Both dark matter and matter were formed from this energy eventually. But the existence of galaxies is reliant on these two matters (matter and dark matter) because otherwise they could not be held together. (...)

So matter and dark matter are nothing more than quarks, leptones and Higgs boson? that sounds interesting! but how massive are these materials?

"WIMP's, or Weakly Interacting Massive Particles, are a leading candidate to comprise dark matter. These theoretical sub-atomic particles only rarely interact with matter, making them "dark." Theories predict these particles will annihilate, releasing gamma radiation. Radiation from these annihilations will happen at very specific energies, according to the theories."

So the big bang energy caused subatomic particles which led to matter and dark matter, so the galaxy can be held together and exist. Is that right?

x

That is very interesting indeed, especially the last paragraph of your writing. Finally I know what dark matter is, how it came into being and what the meaning of the dark matter is. But there is an aspect in which I'm interest in:

In the quote it is written that "particles will annihilate" and that causes a "releasing" of gamma radiation. A radiation which comes into being by an atomic decay too. And the specific energy of this radiation forms the dark matter, if I do that right. So is dark matter nothing more than a product of decay?