Not-so-evil twin: Our image of the week highlights the @ESAGaia engineering model, a hi-fidelity copy of critical avionics systems on the real spacecraft (now in orbit) that helps us test & verify software prior to upload https://t.co/0VkmW1ihcz pic.twitter.com/0DNkBeBMKl

— ESA Operations (@esaoperations) January 18, 2018