NASA has modified its ISS resupply contract with Sierra Space, which builds the robotic Dream Chaser space plane.

The Dream Chaser space plane, a collaborative project between NASA and Sierra Nevada Corporation, marks a new chapter in space exploration. Designed to transport cargo and crew to low Earth orbit, the ...

After NASA retired the space shuttle in 2011, many thought space planes were history. But they are making a comeback with new designs. Several U.S. companies like Sierra Space Corp., Dawn Aerospace, ...