French President Francois Hollande, Prodways CEO Raphael Gorge (R) and Les Mureaux mayor Francois Garay (L) visit Prodways company headquarters in Les Mureaux, west of Paris on 12 April 2016. Prodways is a design and engineering company dedicated to 3D printers technology. / AFP PHOTO / POOL / Christophe Petit TessonCHRISTOPHE PETIT TESSON/AFP/Getty Images

French President Francois Hollande (L), Prodways company CEO Raphael Gorge (C) and Les Mureaux mayor Francois Garay look at a product during a visit at Prodways company headquarter in Les Mureaux, west of Paris on April 12, 2016. Prodways is a design and engineering company dedicated to 3D printers technology. / AFP PHOTO / POOL / Christophe Petit TessonCHRISTOPHE PETIT TESSON/AFP/Getty Images

NOORDWIJK, NETHERLANDS - APRIL 14: A detailed view of the In-Orbit Validation or IOV, the working model of the orbiting Galileo satellite for testing on the ground in the GNSS Payload test facility and Radio Frequency Systems, Payload and Technology Laboratories at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images) Satellites of all kinds have one central characteristic in common. They all have to reach out either to receive commands, transmit scientific findings, relay telecommunications, perform remote sensing or, increasingly, deliver precision navigation and timing data - relying on radio frequencies (RFs) to do so. ESAs Radio Frequency Systems, Payload and Technology Laboratories perform RF research for both the space and ground segments. The Radio Navigation Lab is supporting the current Galileo service rollout. (Photo by Dean Mouhtaropoulos/Getty Images)

NOORDWIJK, NETHERLANDS - APRIL 14: Head of System and Concurrent Engineering Section, Massimo Bandecchi poses in the Systems and Cost Engineering Division / The Concurrent Design Facility at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. The Concurrent Design Facility (CDF) is a state-of-the-art facility equipped with a network of computers, multimedia devices and software tools, which allows a team of experts from several disciplines to apply the concurrent engineering method to the design of future space missions. It facilitates a fast and effective interaction of all disciplines involved, ensuring consistent and high-quality results in a much shorter time. (Photo by Dean Mouhtaropoulos/Getty Images)

NOORDWIJK, NETHERLANDS - APRIL 14: A poster of Mission Studies and Reviews is displayed in the Systems and Cost Engineering Division / The Concurrent Design Facility at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. The Concurrent Design Facility (CDF) is a state-of-the-art facility equipped with a network of computers, multimedia devices and software tools, which allows a team of experts from several disciplines to apply the concurrent engineering method to the design of future space missions. It facilitates a fast and effective interaction of all disciplines involved, ensuring consistent and high-quality results in a much shorter time. (Photo by Dean Mouhtaropoulos/Getty Images)

NOORDWIJK, NETHERLANDS - APRIL 14: A detailed view of the In-Orbit Validation or IOV, the working model of the orbiting Galileo satellite for testing on the ground in the GNSS Payload test facility and Radio Frequency Systems, Payload and Technology Laboratories at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images) Satellites of all kinds have one central characteristic in common. They all have to reach out either to receive commands, transmit scientific findings, relay telecommunications, perform remote sensing or, increasingly, deliver precision navigation and timing data - relying on radio frequencies (RFs) to do so. ESAs Radio Frequency Systems, Payload and Technology Laboratories perform RF research for both the space and ground segments. The Radio Navigation Lab is supporting the current Galileo service rollout. (Photo by Dean Mouhtaropoulos/Getty Images)

NOORDWIJK, NETHERLANDS - APRIL 14: A general view of the 'Clean Room with Air Lock' through to the lab with the In-Orbit Validation or IOV, the working model of the orbiting Galileo satellite for testing on the ground in the Radio Frequency Systems, Payload and Technology Laboratories at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images) Satellites of all kinds have one central characteristic in common. They all have to reach out either to receive commands, transmit scientific findings, relay telecommunications, perform remote sensing or, increasingly, deliver precision navigation and timing data - relying on radio frequencies (RFs) to do so. ESAs Radio Frequency Systems, Payload and Technology Laboratories perform RF research for both the space and ground segments. The Radio Navigation Lab is supporting the current Galileo service rollout. (Photo by Dean Mouhtaropoulos/Getty Images)

NOORDWIJK, NETHERLANDS - APRIL 14: Armen Derderian, Head of Laboratory Unit works in the GNSS Payload test facility with the In-Orbit Validation or IOV, the working model of the orbiting Galileo satellite for testing on the ground in the Radio Frequency Systems, Payload and Technology Laboratories at the European Space Agency on April 14, 2016 in Noordwijk, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images) Satellites of all kinds have one central characteristic in common. They all have to reach out either to receive commands, transmit scientific findings, relay telecommunications, perform remote sensing or, increasingly, deliver precision navigation and timing data - relying on radio frequencies (RFs) to do so. ESAs Radio Frequency Systems, Payload and Technology Laboratories perform RF research for both the space and ground segments. The Radio Navigation Lab is supporting the current Galileo service rollout. (Photo by Dean Mouhtaropoulos/Getty Images)