The human being is an infinitely complex entity who tries to position  himself between the infinitely large and the infinitesimally small. 

 
 
Cosmic sciences and the conquest of space are still able to fill with enthusiasm all those who gaze up at the stars. The great infinity fascinates us by virtue of the beauty and diversity of the images recorded by astronomers: vast spiral galaxies, multicoloured interstellar clouds, astronauts walking on the lunar soil, the stupifying diversity of planetary surfaces captured by space probes...
All of those marvellous photographs, rich in detail, stimulate our imaginations and make us dream of extra-terrestrial worlds to explore.


The other infinity is even more mysterious and more austere: 
Images of atomic particles reduced to points or to spiral tracks.
The science which studies this infinitely small is called
particle physics. 
Its instruments of observation are electron microscopes and gigantic particle colliders. These devices cannot offer images to the public as spectacular as those of the astronomical telescopes.
Nevertheless, we are as closely bound to this universe of elementary particles of which we are intimately composed, as to the whole of the rest of the Universe.

I would like then to invite you to participate in a fabulous journey into the world of matter. You will discover a world intra-terrestrial where our common sense is made to feel ill at ease and where matter flirts with emptiness. 

 
 
 
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