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The day UFOs stopped play
(www.bbc.co.uk)
For discussion of everything rum and uncanny, from cryptozoology (mysterious or out-of-place animals), UFOs, high strangeness, etc. Following in the footsteps of Charles Fort and all those inspired by him, like the field of anomalistics.
As this community is on Feddit.uk it takes a British approach to things but it needn't be restricted to the UK - if it's weird and unusual it probably has a home here.
Elsewhere in the Fediverse:
Could have been an experimental pulsejet fueled by silane + diborane. One of the exhaust products would be beads of molten glass, which would get stretched into threads by the wind as they exit the rocket nozzle at high speed.
A lot of research went into it in the 1950s.
https://en.wikipedia.org/wiki/Zip_fuel
More recently, NASA experimented with using silane + hydrogen gas to light the X-43's scramjet engines.
The problem with using silicon based fuels is that it puts sand in the exhaust and that tends to destroy engines. Its very efficient and powerful while it works though, and it makes a rocket easy to start/re-start because it spontaneously combusts when exposed to air.