King Willem-Alexander of the Netherlands is welcomed to ESTEC's celebration of 50 years of European space cooperation on 16 December 2014. From left to right: Dutch Minister for Foreign Trade and Development Lilianne Ploumen, the Head of the Dutch Delegation to the ESA Council Jasper Wesseling, Dutch ESA astronaut André Kuipers, ESA historian John Krige and the Head of ESTEC Outreach Ninja Menning.