The company conducts research into space propulsion systems, centred on the development of the Skylon re-usable SSTO spaceplane.
In the early 1960s, American research into the Boeing X-20 Dyna-Soar spaceplane was cancelled due to lack of purpose; later the studies contributed to the Space Shuttle, which in turn motivated the Russian Buran (spacecraft).
Science Realms predecessor Science Dawn was a classified program to build a rocket-launched supersonic horizontal-take off horizontal-landing (HOTOL) SSTO spaceplane.