ESA’s Prometheus is the precursor of ultra-low-cost rocket propulsion that is flexible enough to fit a fleet of new launch vehicles for any mission and will be potentially reusable.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/esamovesahea.jpg)
Source:
https://phys.org/news/2020-06-esa-low-cost-reusable-rocket.html