HM King Willem-Alexander of the Netherlands visits ESTEC during an event to mark 50 years of European cooperation in space.

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Astronaut Andre Kuipers at ESTEC during an event to mark 50 years of European cooperation in space.

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Jean-Jacques Dordain, ESA Director-General at ESTEC during an event to mark 50 years of European cooperation in space.

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HM King Willem-Alexander of the Netherlands signs the visitor book at ESTEC, watched by Jean-Jacques Dordain, ESA Director-General and Franco Ongaro, Head of ESTEC

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From left to right: HM King Willem-Alexander of the Netherlands, Jean-Jacques Dordain, ESA Director-General and Franco Ongaro, Head of ESTEC.

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