NASA already plans to launch a spacecraft to the Jupiter moon Europa in the early to mid-2020s, and it's also mulling a mission to the Saturn satellite Enceladus that would lift off by the end of 2021.
NASA already plans to launch a spacecraft to the Jupiter moon Europa in the early to mid-2020s, and it's also mulling a mission to the Saturn satellite Enceladus that would lift off by the end of 2021.