Countdown rehearsal for James Webb Space Telescope

When the James Webb Space Telescope launches in mid-December, the director of operations in the Kourou spaceport in French Guiana will be Jean-Luc Voyer. It'll be his voice counting down to lift-off, or as he will say in French: "Décollage". We asked Jean-Luc to rehearse this historic moment at the console he'll occupy in Kourou's Jupiter control room.