A couple of years ago i was in a debate over solids vs liquids on here.
Experts on here told me in no uncertain terms that solids were not practical and Nasa was wasting it's time.
Well it looks like someone forgot to tell the Europeans.
They have a new Vega rocket.
The rocket is made up of four stages — three solid-propellant stages and a fourth stage, called AVUM, that carries the payload.