“[Balloons] have extremely small radar and thermal cross sections, making them relatively invulnerable to most traditional tracking and targeting method". http

“[Balloons] have extremely small radar and thermal cross sections, making them relatively invulnerable to most traditional tracking and targeting method". https://www.thedrive.com/the-war-zone/why-shooting-down-chinas-spy-balloon-over-the-u-s-is-more-complicated-than-it-seems https://www.thedrive.com/the-war-zone/why-shooting-down-chin...