Experimental or Testbed Shuttles coloring pages (Suborbital or Atmospheric Only)

Before the Space Shuttle reached orbit, engineers tested scaled models and full-size prototypes in the skies and on runways around the world. These four coloring pages feature the lesser-known test vehicles like the Soviet OK-GLI and NASA's Enterprise, each one a critical stepping stone that helped solve the mysteries of hypersonic flight and atmospheric reentry. Settle in and bring these experimental spacecraft to life with your colors, and you'll be coloring the machines that proved spaceflight was possible.