Space.com (VideoFromSpace)

‘Smile’ Spacecraft Prepped for Launch to Study Solar Wind

The video chronicles the final preparations of the SMILE (Solar wind Magnetosphere Ionosphere Link Explorer) mission, which will launch aboard ESA’s Vega C rocket from the French Guiana spaceport. Its primary objective is to observe how Earth’s magnetic field reacts to the solar wind, filling a critical gap in space‑weather science. SMILE weighs 2,300 kg, of which 1,580 kg is hydrazine fuel and oxidizer—enough for roughly 90 % consumption during its first month. After launch, the spacecraft will execute 11 engine burns over 25 days, stretching its trajectory into a highly elliptical orbit that peaks at 121,000 km above the North Pole. The vehicle was encapsulated in Vega C’s carbon‑fiber fairing, a process that marks the last moment humans will see it on Earth. The narration highlights the delicate handling of hydrazine, noting that only a small team in sealed suits can manage the explosive, toxic propellant. It also emphasizes Vega C’s four‑stage architecture, delivering 4,500 kN of thrust in the first stage and a restartable fourth stage for precise orbital insertion, while the discarded stages are de‑orbited to limit debris. By delivering unprecedented measurements of magnetospheric dynamics, SMILE promises to sharpen space‑weather forecasts, helping protect satellites, power grids, and other critical infrastructure from solar storms.