A) Caculations
Very little mass is required, the mass of our sun would be sufficient. Now just within our
galaxy we have many times this critical mass
![calcul des trajectoires des photons](miroir/bmp6.jpg)
As you can see in the calculations above just within our galaxy we have many times this
critical mass, therefore yes the gravitational mirror does work. One galaxy
would create the gravitational field sufficient to produce the mirror effect. No body can doubt
of the existence of our galaxy but what about the others? In the next section we will talk about
the caustic created in concave mirrors. Our presentation is a simplified expression of what
we believe is happening, an optical illusion. For example, magician use a half sphere mirror to
create a real three dimensional image in front of the mirror. It fools everyone the object seems
real. That is why we used the terminology "magic" in our presentation
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