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De nos jours, la meilleure estimation du moment où le Big Bang s'est produit -

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et une fois de plus, je n'aime pas trop ce terme, car il a l'air de vouloir dire

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qu'il y a eu une explosion, alors qu'en réalité il s'agit d'une expansion de l'espace

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- quand l'espace a commencé à se développer à partir d'une singularité

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mais notre meilleure estimation du moment où ça c'est produit, est il y a

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13.7 milliards d'années, et bien que nous ayons l'habitude de manipuler

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des milliards, en particulier lorsque nous parlons

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de grosses sommes d'argent par exemple, ceci est une durée d'une longueur

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inimaginable. On peut penser pouvoir conceptualiser une telle durée, mais

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c'est impossible. Et d'ailleurs, dans d'autres vidéos, je

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parlerai des échelles de temps, pour que vous puissiez réaliser a quelle point

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cette durée est immense, ou commencer à réaliser, ou même réaliser

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qu'on ne PEUX PAS apprécier ce que représente 13,7 milliards d'années.

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Je voudrais également insister sur le fait qu'il s'agit là

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de la meilleure estimation disponible. Pendant la durée de ma propre existence,

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ou de la partie de mon existence depuis que je connais l'existence du big bang et

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que je m'intéresse à cette meilleure estimation,

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cette durée a changé, et je suppose

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que dans le future, cette durée va devenir plus précise,

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ou même changer.

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Mais c'est la meilleure estimation que l'on aie. Ceci dit, je voudrais

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que l'on pense a ce que celà signifie concernant la taille

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de l'univers observable.

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Donc, si toute l'expansion a démarrée il y a 13,7 milliards d'années,

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et si tout ce que l'on connait de notre univers à 3 dimensions

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tenait dans un point,

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la plus grande distance qu'un photon de lumière pourrait parcourir

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s'il nous atteint aujourd'hui...

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(alors, c'est notre œil juste...)

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(alors, disons que c'est mon œil juste ici)

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(voilà mes cils, juste là)

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la plus grande distance - alors, quelques photons de lumière,

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arrivent dans mon œil, ou alors

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arrivent dans la lentille d'un télescope -

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la plus grande distance qu'ils aient pu parcourir

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est de 13,7 milliards d'années lumières.

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