Juice will spend several weeks being subjected to extreme heating and cooling cycles under vacuum, to confirm the spacecraft is ready for its long journey through the Solar System to Jupiter. Juice will experience highs of 250ºC when swinging by around Venus, and lows of around -180ºC in the Jovian system.
The LSS is Europe's single largest vacuum chamber standing 15 m high and 10 m wide.

Juice will remain at ESTEC until beginning of August, before being transported to Toulouse for its final round of tests. From there it will travel to Europe’s Spaceport in French Guiana, to be launched on an Ariane 5 rocket next year.

Once in the Jovian system the mission will make detailed observations of the giant gas planet and its three large ocean-bearing moons – Ganymede, Callisto and Europa – with a suite of remote sensing, geophysical and in situ instruments. The mission will investigate the emergence of habitable worlds around gas giants and the Jupiter system as an archetype for the numerous giant exoplanets, now known to orbit other stars.