False picture possible on optical telescopes

[Yanosh]

It is a well-known fact that the universe is expanding. This means that the farther we look in the universe, the farther speed away the objects there are from us.

In this case, based on the Doppler Effect, the frequency of electromagnetic waves will be slide in a lower region.

 

This means that when you look at to a certain distance with the optical telescope, the colors shift, because of the Doppler Effect. Red going to be yellow, yellow will be green, etc., and magenta slides to UV (Ultra-violet).

It is not a major problem. However the visual will be false.

 

On the other hand, if we look at a much more distant region, the optical light could slide to UV region totally. If the distance is even greater, the optical light could slide into X-ray region, or even into microwaves. It is depend of distance between us and the object because due to the increasing distance, the speed of the object also greater, (compared to us) due to the expansion of universe.

In fact, the result is that optical light from this region will be invisible when viewed through an optical telescope.

 

Probably, this is the dark matter. It is there, but we not able to see it, through the optical telescope, because it shifted into the invisible region of electromagnetic waves, what is invisible for our eyes.

 

(If anything visible in this region through the optical telescope, it is the infrared or radio wave. That of one has slipped into the visible light range, because of the Doppler Effect.)

 

[exchemist]

8 minutes ago, Yanosh said:

It is a well-known fact that the universe is expanding. This means that the farther we look in the universe, the farther speed away the objects there are from us.

 

In this case, based on the Doppler Effect, the frequency of electromagnetic waves will be slide in a lower region.

 

 

 

This means that when you look at to a certain distance with the optical telescope, the colors shift, because of the Doppler Effect. Red going to be yellow, yellow will be green, etc., and magenta slides to UV (Ultra-violet).

 

It is not a major problem. However the visual will be false.

 

 

 

On the other hand, if we look at a much more distant region, the optical light could slide to UV region totally. If the distance is even greater, the optical light could slide into X-ray region, or even into microwaves. It is depend of distance between us and the object because due to the increasing distance, the speed of the object also greater, (compared to us) due to the expansion of universe.

 

In fact, the result is that optical light from this region will be invisible when viewed through an optical telescope.

 

 

 

Probably, this is the dark matter. It is there, but we not able to see it, through the optical telescope, because it shifted into the invisible region of electromagnetic waves, what is invisible for our eyes.

 

 

 

(If anything visible in this region through the optical telescope, it is the infrared or radio wave. That of one has slipped into the visible light range, because of the Doppler Effect.)

 

 

 

There are several misconceptions in what you have written.

Firstly the shift in wavelength as one looks at more distant objects is a red shift. You are describing a blue shift. What happens is that the wavelengths get longer (=lower frequency) at longer distances, which shifts the yellow to the red and the blue to the green etc.

Secondly, the cosmological red shift is not actually a Doppler shift but is caused by the expansion of space itself stretching out the waves.

Thirdly, dark matter is so-called because it appears neither to emit nor absorb radiation at any wavelength. Astronomers are not so silly as to have only looked at the visible range of the spectrum.  

So dark matter really is dark. It is not just something to do with emission being red-shifted. 

[Ghideon]

32 minutes ago, Yanosh said:

Probably, this is the dark matter. It is there, but we not able to see it, through the optical telescope, because it shifted into the invisible region of electromagnetic waves, what is invisible for our eyes.

There is evidence of dark matter in galaxies that are observable in visible light. The bullet cluster may be of interest: https://en.wikipedia.org/wiki/Bullet_Cluster. 

Edited May 4, 2021 by Ghideon
grammar

[beecee]

3 minutes ago, Ghideon said:

There is evidence of dark matter in galaxies that are observable in visible light. The bullet cluster may be of interest: https://en.wikipedia.org/wiki/Bullet_Cluster. 

😊 Great minds and all that! Just about to post on the same thing.

39 minutes ago, Yanosh said:

In fact, the result is that optical light from this region will be invisible when viewed through an optical telescope.

The expansion of the universe/space/time causes a cosmological redshift for EMR, not a Doppler shift. The other type is gravitational red/blue shift, caused by any EMR climbing out and/or falling into gravitational wells...climbing out is shifted to the redend and falling in is blueshifted.