1-http://www.dailymotion.com/video/xoui6z_2012-conference-d-un-scientifique-astronome-1-de-3_tech<br />2-http://www.dailymotion.com/video/xouh8w_2012-conference-d-un-scientifique-astronome-2-de-3_tech<br />3-http://www.dailymotion.com/video/xouh8p_2012-conference-d-un-scientifique-astronome-3-de-3_tech
