The U.S. Space Force is putting an indefinite halt on all national security missions aboard United Launch Alliance's Vulcan Centaur, following a repeat anomaly with the rocket's side boosters.
The Solar System's icy moons are a focal point in our search for habitability and life. Among them are Europa, Ganymede, and Callisto, all Galilean moons of Jupiter. Their environmental conditions play a big role in potential habitability, but so does chemistry. Without the right molecular building blocks, life can't get started.

