text: La City de l 'Espace ( exit 17 or 18 from the ring road ; m ? ? tro Marengo ) is a huge space complex , with a planetarium and a park laid out like the solar system , dominated by a replica of the Ariane rocket in whose control room you can prepare for launch and watch the deployment of a satellite .
  
  ###
  
  The planetarium is only open at weekends .