Radian Aerospace (Radian), the developers of the world's first fully reusable horizontal takeoff and landing, single-stage to orbit spaceplane, announced that the company recently closed $27.5 million in seed funding.

The recent round was led by Fine Structure Ventures, a venture capital fund affiliated with FMR LLC, the parent company of Fidelity Investments, with additional investment from EXOR, The Venture Collective, Helios Capital, SpaceFund, Gaingels, The Private Shares Fund, Explorer 1 Fund, Type One Ventures as well as others.