On 20 March, specialists filled the European-Chinese Smile mission with fuel ahead of its launch on a Vega-C rocket on 9 April. Smile has four fuel tanks, making the bulbous shape underneath the solar panels. Each tank carries 380 litres of hydrazine fuel and oxidiser, which will feed an engine that can deliver 490 Newtons of thrust. The total weight of the spacecraft is 2300 kg, 1580 kg of which ...