{"id":7001,"date":"2012-03-02T18:33:46","date_gmt":"2012-03-02T17:33:46","guid":{"rendered":"http:\/\/www.ziserman.com\/blog\/?p=7001"},"modified":"2012-03-02T18:33:28","modified_gmt":"2012-03-02T17:33:28","slug":"voyager-dans-le-passe-facile","status":"publish","type":"post","link":"https:\/\/www.ziserman.com\/blog\/2012\/03\/02\/voyager-dans-le-passe-facile\/","title":{"rendered":"Voyager dans le pass\u00e9 : facile !"},"content":{"rendered":"

Ce billet est compl\u00e8tement hors sujet, vous voil\u00e0 pr\u00e9venus \ud83d\ude09<\/p>\n

C’est parti :<\/p>\n

Certains vous dirons qu’on ne peut pas voyager dans le pass\u00e9.<\/p>\n

C’est bien \u00e9videmment compl\u00e8tement faux<\/strong>.<\/p>\n

Quand on regarde le soleil, on ne le voit pas tel qu’il est au moment ou on le regarde, mais avec quelques minutes de retard (8 je crois).<\/p>\n

Normal : il est loin, et la lumi\u00e8re met un certain temps \u00e0 nous parvenir.<\/p>\n

Plus on regarde loin, et plus on voyage dans le pass\u00e9 donc. On peut donc voir le pass\u00e9, mais pas le changer.<\/p>\n

La plus proche \u00e9toile nous apparait donc tel qu’elle \u00e9tait il y a quelques ann\u00e9es.<\/p>\n

Quand on plonge les t\u00e9lescopes les plus puissants dans la bonne direction, on arrive \u00e0 voyager beaucoup plus loin, dans l’espace et dans le temps<\/strong>.<\/p>\n

On arrive ainsi \u00e0 remonter dans le temps, loin, tr\u00e8s loin<\/strong> : on arrive \u00e0 voir des choses qui se sont pass\u00e9es il y a des milliards d’ann\u00e9es (13 aux derni\u00e8res nouvelles<\/a>).<\/p>\n

On voit donc l’univers, quelques 600 millions d’ann\u00e9es apr\u00e8s sa naissance, puisque l’age de l’univers est estim\u00e9 \u00e0 13,6 Milliards d’ann\u00e9es<\/a>.<\/p>\n

D’ou le paradoxe que j’ai en t\u00eate depuis bien longtemps :<\/p>\n

Si on continue, et qu’on arrive \u00e0 voir des choses toutes proches de la naissance de l’univers, on va finir par… voir d’ou on vient : se voir soit m\u00eame (enfin nos particules…) , dans le pass\u00e9.<\/p>\n

Et alors l\u00e0, je \u00ab\u00a0tilt\u00a0\u00bb, je disjoncte : comment peut on se voir soi m\u00eame ?<\/strong><\/p>\n

\"\"<\/a><\/p>\n

La seule fa\u00e7on, la seule explication, c’est d’avancer plus vite que la lumi\u00e8re !<\/p>\n

Imaginez : vous \u00eates \u00e0 l’endroit A. Vous \u00ab\u00a0courrez\u00a0\u00bb tr\u00e8s vite, vers le point B. Vous d\u00e9fiez les lois de la relativit\u00e9, en allant plus vite que la lumi\u00e8re (je sais, Einstein a dit que c’\u00e9tait pas possible, mais c’est juste pour l’explication). En vous retournant (toujours tr\u00e8s vite), vous vous verrez en A, dans le pass\u00e9.<\/p>\n

Donc je ne sais pas r\u00e9soudre ce paradoxe :<\/p>\n

Quelle sera la limite \u00e0 ce voyage dans le temps ?<\/p>\n

Comment peut on voir aussi loin ?<\/p>\n

Comment est-ce possible, alors qu’on se d\u00e9place bien moins vite que la lumi\u00e8re ?<\/p>\n

Et puis, tant que j’y suis : puisque le temps se d\u00e9forme, quand la masse d’un corps est tr\u00e8s lourde, j’avais cru comprendre que le temps \u00ab\u00a0s’effondrait\u00a0\u00bb \u00e0 la naissance de l’univers. Autrement dit, plus on se rapproche de la naissance de l’univers, plus le temps se d\u00e9forme, pour arriver \u00e0 la limite, au moment du big band, \u00e0 s’arr\u00eater.<\/p>\n

Dans ce cas, si c’est vrai, \u00e7a revient \u00e0 dire que le big bang n’est pas simplement le d\u00e9but de l’univers, c’est aussi la naissance du temps, et \u00e7a veut dire que remonter \u00e0 la naissance n’a pas de sens, ou en tout cas, que le point est impossible \u00e0 atteindre (c’est une limite).<\/p>\n

Help, y a-t-il quelqu’un qui puisse m’aider ?<\/p>\n

Et comme dirait \u00ab\u00a0Le Chat\u00a0\u00bb, pendant ce temps l\u00e0, ma bagnole fait de l’huile…<\/p>\n","protected":false},"excerpt":{"rendered":"

Ce billet est compl\u00e8tement hors sujet, vous voil\u00e0 pr\u00e9venus \ud83d\ude09 C’est parti : Certains vous dirons qu’on ne peut pas voyager dans le pass\u00e9. C’est bien \u00e9videmment compl\u00e8tement faux. Quand on regarde le soleil, on ne le voit pas tel qu’il est au moment ou on le regarde, mais avec quelques minutes de retard (8 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[2],"tags":[24],"class_list":["post-7001","post","type-post","status-publish","format-standard","hentry","category-e-commerce","tag-hors-sujet"],"yoast_head":"\nVoyager dans le pass\u00e9 : facile ! - Ziserman.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ziserman.com\/blog\/2012\/03\/02\/voyager-dans-le-passe-facile\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Voyager dans le pass\u00e9 : facile ! - Ziserman.com\" \/>\n<meta property=\"og:description\" content=\"Ce billet est compl\u00e8tement hors sujet, vous voil\u00e0 pr\u00e9venus \ud83d\ude09 C’est parti : Certains vous dirons qu’on ne peut pas voyager dans le pass\u00e9. 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