Our #Mars Yard, used to test advanced rovers for alien planets #OpenESTEC pic.twitter.com/Oq5PoNEVTu — ESA (@esa) October 8, 2017

Bedankt voor jullie bezoek! — ESA (@esa) October 8, 2017

Our test centre here at @ESA_Tech is also open to visitors today #openESTEC pic.twitter.com/uwuemW6AQb — ESA (@esa) October 8, 2017

Walking ESTEC’s 200m-long main corridor during peak #OpenESTEC pic.twitter.com/O42gTfNaoa — ESA Technology (@ESA_Tech) October 8, 2017

Now hearing all about @esascience missions with Science Advisor @markmccaughrean at #OpenESTEC (join us now in Escape tennis hall) pic.twitter.com/vzAZUBc6HQ — ESA (@esa) October 8, 2017

Join us behind the scenes at #OpenESTEC over on @Snapchat! You can find us under the username 'esa'. pic.twitter.com/unMhyhnC5S — ESA (@esa) October 8, 2017

Our scientists are busy explaining #ESA #space #science missions at #openESTEC today in the Netherlands @BepiColombo @esagaia #EuclidMission pic.twitter.com/jvPsywGqvd — ESA Science (@esascience) October 8, 2017

Plenty for kids to see and do at today's open day at our technical centre in the Netherlands #openESTEC #WvdW pic.twitter.com/6yB4BlaCAH — ESA (@esa) October 8, 2017

Taking a tour of the @Space_Station with @astro_andre and @sanderkoenen at #openESTEC #WvdW pic.twitter.com/F4G2rg2T3s — ESA (@esa) October 8, 2017