{"id":42820,"date":"2021-02-03T15:56:32","date_gmt":"2021-02-03T20:56:32","guid":{"rendered":"https:\/\/cifar661.wpengine.com\/cifarnews\/2021\/02\/03\/heather-graham-is-questioning-assumptions-about-what-life-can-be\/"},"modified":"2021-11-24T06:13:54","modified_gmt":"2021-11-24T11:13:54","slug":"heather-graham-remet-en-question-les-hypotheses-sur-la-nature-possible-de-la-vie","status":"publish","type":"post","link":"https:\/\/cifar.ca\/fr\/cifarnews\/2021\/02\/03\/heather-graham-remet-en-question-les-hypotheses-sur-la-nature-possible-de-la-vie\/","title":{"rendered":"Heather Graham remet en question les hypoth\u00e8ses sur la nature possible de la vie"},"content":{"rendered":"<h2 class=\"cust-post-title\"><span style=\"color: #da291c;\"><strong>En r\u00e9fl\u00e9chissant \u00e0 l\u2019\u00e9ventuelle \u00e9volution diff\u00e9rente de formes de vie sur d\u2019autres plan\u00e8tes, elle fait en sorte que nous puissions faire confiance aux futures d\u00e9couvertes all\u00e9gu\u00e9es de vie extraterrestre.<\/strong><\/span><\/h2>\n<p><a href=\"https:\/\/cifar.ca\/fr\/biographie\/heather-graham\/\"><span style=\"font-weight: 400;\">Heather Graham<\/span><\/a><span style=\"font-weight: 400;\">, boursi\u00e8re du CIFAR, est anim\u00e9e d\u2019une curiosit\u00e9 insatiable et d\u2019une \u00e9trange capacit\u00e9 \u00e0 rep\u00e9rer les hypoth\u00e8ses bancales que le reste du monde accepte d\u2019embl\u00e9e.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Prenons par exemple les plantes qui poussent dans le sous-bois ombrag\u00e9 des for\u00eats. Au cours de son doctorat, Graham a \u00e9tudi\u00e9 le moment o\u00f9 les plantes ont acquis la capacit\u00e9 de pousser \u00e0 l\u2019ombre. \u00ab Elles vivent naturellement l\u00e0 o\u00f9 il y a peu de nourriture, dit-elle. C\u2019est un peu fou. Ce qui est encore plus bizarre, c\u2019est qu\u2019il semble que cette capacit\u00e9 soit d\u2019apparition assez r\u00e9cente \u00bb. En \u00e9tudiant des fossiles de plantes \u00e0 graines datant de l\u2019\u00e9poque de la disparition des dinosaures, elle a d\u00e9couvert que la capacit\u00e9 de pousser \u00e0 l\u2019ombre est apparue \u00e0 la fin du Cr\u00e9tac\u00e9.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En raison de son enthousiasme pour le monde qui l\u2019entoure, Graham s\u2019est int\u00e9ress\u00e9e aux arts, \u00e0 la construction de bateaux et \u00e0 la botanique avant de se lancer dans une carri\u00e8re scientifique. Son parcours l\u2019a men\u00e9e \u00e0 l\u2019universit\u00e9 plus tardivement que beaucoup de ses pairs.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00ab Je suis un peu nouvelle dans le milieu, dit Graham. J\u2019ai commenc\u00e9 l\u2019universit\u00e9 \u00e0 30 ans. \u00bb<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u2019est l\u2019id\u00e9e que les compos\u00e9s chimiques puissent s\u2019organiser en formes de vie et \u00e9voluer sur des milliards d\u2019ann\u00e9es pour s\u2019adapter \u00e0 leur plan\u00e8te qui a men\u00e9 Graham \u00e0 la science.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Elle est maintenant boursi\u00e8re au sein du programme<\/span><a href=\"https:\/\/cifar.ca\/fr\/programmes-de-recherche\/terre-4d-science-et-exploration-du-sous-sol\/\"> <span style=\"font-weight: 400;\">Terre 4D : Science et exploration du sous-sol du CIFAR<\/span><\/a><span style=\"font-weight: 400;\"> et chercheuse au Goddard Space Flight Centre de la NASA, o\u00f9 elle \u00e9tudie les biosignatures agnostiques : des signes de vie qui ne supposent pas que la vie doit \u00e9voluer comme elle l\u2019a fait ici sur Terre.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00ab L\u2019interaction entre une plan\u00e8te et la vie me fascine, dit Graham. Je suis s\u00fbre qu\u2019en pr\u00e9sence d\u2019un syst\u00e8me physique diff\u00e9rent, il y aura toute une s\u00e9rie d\u2019interactions diff\u00e9rentes. La n\u00e9gociation entre la plan\u00e8te et l\u2019organisme sera compl\u00e8tement diff\u00e9rente et dictera les r\u00e8gles de la biologie comp\u00e9titive. \u00bb<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"The search for life as we don\u2019t know it - Heather Graham - CIFAR Virtual Talk\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/htujNW_eZ1k?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p><span style=\"font-weight: 400;\">Les r\u00e9unions du programme Terre 4D : Science et exploration du sous-sol du CIFAR ont beaucoup stimul\u00e9 Graham, m\u00eame au beau milieu d\u2019une pand\u00e9mie. La premi\u00e8re r\u00e9union en personne, en novembre 2019, a donn\u00e9 lieu \u00e0 plusieurs id\u00e9es qui ont d\u00e9bouch\u00e9 sur des projets dot\u00e9s de<\/span><a href=\"https:\/\/cifar.ca\/fr\/programmes-de-recherche\/fonds-catalyseur-du-cifar\/\"> <span style=\"font-weight: 400;\">fonds Catalyseur<\/span><\/a><span style=\"font-weight: 400;\"> et qui explorent des orientations prometteuses pour la recherche future.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00ab Nous nous sommes r\u00e9unis, nous avons discut\u00e9 et nous avons d\u00e9battu de folles id\u00e9es, explique Graham. J\u2019adore avoir un forum pour faire \u00e7a. Nous avons vraiment pu faire preuve de cr\u00e9ativit\u00e9. \u00bb<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u2019un des projets dot\u00e9s de fonds Catalyseur, r\u00e9alis\u00e9s avec les boursi\u00e8res du CIFAR B\u00e9n\u00e9dicte M\u00e9nez (Universit\u00e9 Paris Diderot) et Magdalena Osburn (Universit\u00e9 Northwestern), vise \u00e0 d\u00e9couvrir des lieux naturels qui ne soutiennent <\/span><em><span style=\"font-weight: 400;\">pas<\/span><\/em><span style=\"font-weight: 400;\"> la vie.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00ab Il y a cette id\u00e9e \u00e0 la Geoff Goldblum selon laquelle la vie finit toujours par triompher, explique Graham. Mais c\u2019est faux. Il y a des niches sur notre plan\u00e8te qui sont compl\u00e8tement inhabit\u00e9es et qui suscitent beaucoup d\u2019int\u00e9r\u00eat. Qu\u2019est-ce qui a bris\u00e9 la vie dans ces endroits? \u00bb<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les orientations de recherche de Graham peuvent sembler contre-intuitives : trouver des moyens de chercher la vie telle que nous ne la connaissons <\/span><em><span style=\"font-weight: 400;\">pas<\/span><\/em><span style=\"font-weight: 400;\"> et chercher des endroits o\u00f9 elle n\u2019existe <\/span><em><span style=\"font-weight: 400;\">pas<\/span><\/em><span style=\"font-weight: 400;\">. Ses travaux ouvrent la voie \u00e0 des d\u00e9couvertes de vie sur d\u2019autres mondes auxquelles nous pourrons pr\u00eater foi. Les recherches importantes de Heather Graham, jumel\u00e9es \u00e0 son enthousiasme contagieux et \u00e0 son esprit de collaboration, font d\u2019elle un brillant cerveau au sein de la communaut\u00e9 du CIFAR.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p><strong>Photographie suppl\u00e9mentaire fournie par <a class=\"PrimaryLink BaseLink\" href=\"https:\/\/nasa.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">nasa.com<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En r\u00e9fl\u00e9chissant \u00e0 l\u2019\u00e9ventuelle \u00e9volution diff\u00e9rente de formes de vie sur d\u2019autres plan\u00e8tes,<\/p>\n","protected":false},"author":65,"featured_media":42816,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1842,4690],"tags":[4963,4592],"class_list":["post-42820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-profil","category-terre-4d-science-et-exploration-du-sous-sol","tag-heather-graham-fr","tag-mars-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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