KEY POINTS
  • Relativity Space signs five-year agreement to use Launch Complex 16 at Cape Canaveral Air Force Station.
  • The young start-up joins SpaceX, United Launch Alliance and Blue Origin as the fourth private company to have an orbital launch site at Cape Canaveral.
  • Relativity is building a mid-size orbital rocket with 95 percent 3-D printed parts.
A computer rendering shows Relativity Space's rocket Terran launching from Cape Canaveral's LC-16 launchpad.

Relativity Space, a three-year-old start-up that aims to build rockets using 3D printers, announced a contract Thursday with the U.S. Air Force to build and operate a launch facility at Cape Canaveral Air Force Station in Florida.

"Cape Canaveral is the premier launch site in the U.S.," Relativity CEO Tim Ellis told CNBC.