"Experts know what the Foo Fighters were in world war 2" get ready for this. swampgas!

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In the 1940s, Allied pilots during the Second World War reported being hounded by fast-moving blobs, which they dubbed “foo fighters”.

Shaped like clouds, donuts, balls and spheres, and often glowing or translucent, the strange entities have fuelled conspiracy theories that Earth was being visited by advanced civilisations.

Now a paper suggests the phenomena are in fact plasmas, or ionised gases, which are drawn to the electrical charge of aircraft, spacecraft and satellites.