A Nasa spacecraft rocketed away on a quest to explore Jupiter's tantalising moon Europa and reveal whether its vast hidden ocean might hold the keys to life.It will take Europa Clipper five and a half years to reach Jupiter, where it will slip into orbit around the giant gas planet and sneak close to Europa during dozens of radiation-drenched flybys.

A Nasa spacecraft rocketed away on a quest to explore Jupiter's tantalising moon Europa and reveal whether its vast hidden ocean might hold the keys to life.It will take Europa Clipper five and a half years to reach Jupiter, where it will slip into orbit around the giant gas planet and sneak close to Europa during dozens of radiation-drenched flybys.