The upper stage for Europe’s newest rocket Ariane 6 passed its final tests at ESA’s facilities in the Netherlands last week, qualifying the upper stage for a launch on the most powerful, four-booster, variant of the Ariane 6 rocket. The upper stage for Europe’s newest rocket Ariane 6 passed its final tests at ESA’s facilities in the Netherlands last week, qualifying the upper stage for a launch on the most powerful, four-booster, variant of the Ariane 6 rocket. Space Exploration Phys.org – latest science and technology news stories