Shuttle had solid-fuel boosters and hypergolic thrusters for on-orbit maneuvering. The Delta IV Heavy, on the other hand, is a fully hydrogen-powered rocket: th

Shuttle had solid-fuel boosters and hypergolic thrusters for on-orbit maneuvering. The Delta IV Heavy, on the other hand, is a fully hydrogen-powered rocket: three common cores, with an RL10-powered upper stage. It also launched the Parker Solar Probe, which has been doing rounds around the sun for a while now.