We don't need dark matter (Isaac Newton VS Zwicky and co) (Dark matter is a lucubration of swindlers and hooks calling themselves “scientists”)

A simple program (Free Basic 2006) , Newton's basic equations, convert into grey color images of galaxy (8 bits images (50x50) with 256 possible values in relation with the luminosity of the group of stars in each pixel of the photography)
A few minutes or more (75 minutes pour 256*256 images multiplied by 2^4 for a double size image)
The proof : Newton's equations describe perfectly the movement of the stars in the elliptic and spiraled galaxies. The basic equations of Newton give the explicative accelerations to preview the speeds that we see in the sky.
Dark matter is a stupid lucubration invented by ignorants and enemies of Newton and his absolute movements in the absolute space.

QUICK METHOD (a simple photo a visible galaxy)

0° Transform the photo to grey with only 256 colors (8 bits BMP in grey scale)

1° Calculation of the total of the value inside the 2500 bytes (50x50) of the photo.
It is the (proportional) number of stars.
200 E9 divided by that number is the « star factor ».
We consider that the true number of star in each pixel is the value of the byte multiplied by that « star factor ».
And the

2° For each pixel of the photo we calculate the distance (R) to each of the 2499 others pixels (50²-1) of the photo.
To calibrate the process, fictitiously we suppose the size of the photo equal to the diameter of the Wily Way.

3° For each pixel we calculate the Newton's formula ( G*M_sun/R²).
The result is multiplied by the value of the “emitting pixel” and by the « star factor ».
Example :
The value of the “emitting pixel” is 128 (middle grey).
The distance between the zone of the “emitting pixel” and the “receiving pixel” is 1000 light years. (1000*31557600*299792458=1000*9,46 E 15= 9,46E18 meters)
It is simple to divide GM (1.326 E 20) by the square of the distance :
We obtain the acceleration given by ONE star (whose mass is equal to the sun's mass)
1.423 E -12 (m/S)
But, in that “pixel zone” there is more than one star. Then we multiplied the result by 128 The value of the “emitting pixel” and by the « star factor ».
We obtain the total acceleration given by that “pixel zone”

Vocabulary

Emitting pixel. Each pixel of the photography is considered as a zone where a number of stars have emitted the light we see.
The quantity of attraction produced by a emitting pixel if proportional to the byte (and inversely proportional to the square of the (true) distance between the emitting pixel and the receiving pixel.)
Pixel zone : On the photography, one pixel reflect the light emitted by a group of star.
Star factor. A number. Obtained dividing the total number of the stars (the sun's mass) of a galaxy by the sum of the bytes of a grey scale photo. The value of one point indicate that N stars have emitted the light. N is equal to the value of Star factor.
Receiving pixel : Each pixel of the photography is considered as a zone where a number of stars received the light we see emitted by all the others “pixel zones”.