Leaked Pentagon docs show the shot-down Chinese spy balloon may have had a feature known as 'synthetic aperture radar' that can see through certain materials, WaPo reports
Photo provided by the Jet Propulsion Laboratory 15 April 1994 in Pasadena, Ca, shows false-color composite image of Mount Pinatubo in the Philippines taken by Spaceborne Imaging Radar-C and X-Band Synthetic Aperture Radar aboard the Space Shuttle Endeavour on orbit 78 13 April 1994.
