Jupiter's moons hide giant subsurface oceans − Europa Clipper is one of 2 missions on their way to see if these moons could support life 

 Jupiter has dozens of moons. Four of them in particular are of interest to planetary scientists. 

https://cdn.mos.cms.futurecdn.net/wEkX9JhAKJxyA62aVRGZGj.jpg

https://www.space.com/space-exploration/search-for-life/jupiters-moons-hide-giant-subsurface-oceans-europa-clipper-is-one-of-2-missions-on-their-way-to-see-if-these-moons-could-support-life