NASA is set to launch its Europa Clipper spacecraft Monday atop a SpaceX Falcon Heavy rocket for its first mission to Jupiter since 2011. The mission is scheduled for 12:06 p.m. ET and weather conditions appear favorable for Europa Clipper to begin its six-year journey Jupiter's icy moon Europa.

Scientists at NASA are hoping to find out. Europa is the fourth-largest of Jupiter’s moons and has a saltwater ocean under its ice shell that has twice the amount of water contained in Earth’s oceans.