https://futurism.com/the-byte/stratospheric-balloons-darpa
DARPA's Balloons Could Hover at the Edge of Space Indefinitely
DARPA is testing a sensor that would allow stratospheric balloons to remain in one place, possibly leading to a new military surveillance platform.
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https://spaceref.com/science-and-exploration/first-hd-camera-at-the-edge-of-space/
First HD Camera At The Edge Of Space - SpaceRef
May 24, 2013 - Space news and reference site.
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https://www.cam.ac.uk/research/news/high-speed-at-the-edge-of-space
High Speed at the Edge of Space | University of Cambridge
Students from the Cambridge University Spaceflight team (CUSF) have successfully tested model parachutes for the ExoMars lander. The ExoMars lander project is
at the edge of spacehigh speeduniversitycambridge