PICTURE SHOWS: Artist impression of ExoMars Trace Gas Orbiter ..... STORY COPY: Spiders on Mars? A giant blue hairy spider-like shape features in a showcase of images from the ESA-Roscosmos Trace Gas Orbiter. Curious surface features, water-formed minerals, and even a sighting of the InSight lander showcase the impressive range of imaging capabilities of the craft. The ESA-Roscosmos Trace Gas Orbiter, or TGO, launched three years ago today, on 14 March 2016. It arrived at Mars on 19 October that year, and spent over a year demonstrating the aerobraking technique needed to reach its science orbit, starting its prime mission at the end of April 2018. When: 20 May 2015 Credit: ESA/ATG medialab/Cover Images **CREDIT (This picture): ESA/ATG medialab/Cover Images**