My guess why orbs are usually reported at 20,000ft

Polymer-Encapsulated Aerogel Fibers Prepared via Coaxial Wet Spinning with Stepwise Coagulation for Thermal Insulation

Polymer-wrapped aerogel orbs encapsulating a vacuum state and miniaturized equipment might require a higher operating altitude.

Near weightlessness with thermal insulating properties (no heat signature, anyone?)

Transparent/ indefinite shape?

It’s us.

submitted by /u/DAT_DROP
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