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Dark matter in Universe - does it exist?

Dark matter in Universe - does it exist? Are we ever going to know the right answer? As it sounds the scientists want it to exist. What about gravitational force without any physical collision?

Different articles and TV programs have presented something called dark matter. But what is it? What is its role?

As this is an area where scientist still do not have any evidences or explanations it is free for us to lead a discussion about this subject. That makes it much more exciting. As an author and owner of this magazine, I have decided to write a reportage about this.

What about NASA, what is their theory, if they have any? One interesting sentence we can read at their website is:

We are much more certain what dark matter is not than we are what it is.

If NASA is not so sure about the dark matter who else is? What about CERN in Switzerland? On their website we read this:

Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot.

The National Geographic writes this:

Scientists have not yet observed dark matter directly. It doesn't interact with baryonic matter and it's completely invisible to light and other forms of electromagnetic radiation, making dark matter impossible to detect with current instruments.

The NewScientists starts their article with:

What’s invisible, but bigger than anything we can see? It sounds like the beginning of a bad joke, and for physicists, that’s just what it is.

Graviational force in galaxies

As it looks like, we can be sure that the science one day will have concrete evidences and an explanation what the dark matter is or what it is not. In other words, we assume that we one day will know if it exists or not.

The question is, does dark matter must exist? As it sounds the scientists want it to exist. Suddenly they talk about some graviational force that makes stars in a galaxy orbit at more or less same speed regardless of where they are in the galaxy. According to standard physics, stars at the edges should travel much slower than those near the galactic center. And they do not. That seems to be the reason for why dark matter is born.

The collision

Dark matter seems to be something that connects boundary stars with inner stars so they keep the same or similar orbiting speed. But how can that be possible if it is ”not visible” as everything else in the Universe? And how can something ”not visible” affect stars in this case by the graviational force without creating any physical collision?

Dark matter in solar system

If dark matter possibly exists in galaxies according the observations about stars orbitin speed, why doesn’t it exist in solar systems such as ours? Our planets orbit the Sun at different speed. Nothing affects their speed. According to http://cdms.berkeley.edu the explanation must be following:

Dark matter should have gravitational effects on the planets orbits and on space probes, but we are so far unable to detect them. This is not surprising, however, because they are hidden by bigger effects: the gravitational pulls of the sun and planets are much, much larger.

And also in:

Dark matter is not distributed uniformly in space. The galaxy is embedded in a large cloud of dark matter, and gravity makes this cloud denser in the center than at the edges.

I have now been looking at some different sources with similar explanations about the dark matter. What NASA wrote according to what we mentioned earlier in this article is right.

Are we ever going to know the right answer? Probably yes. But it requires more time and work. What will the right answer be?

I guess that the dark matter does not exist because I believe that anything that creates or contributes to gravitational forces should also create a risk for collision and get involved in it.

If dark matter does not create collisions then it probably does not exist but that does not mean that we can ignore the existence of some other force or matter (like those we can see) that affects the orbiting speed of stars in a galaxy.