ASTRA TR-3B

The TR-3B "Black Manta" is a purported top-secret, triangular spy plane, often described in UFO lore as an anti-gravity spacecraft rather than a conventional aircraft. Because its existence is not acknowledged by the U.S. military, there are no official performance stats, though popular myths claim it achieves hypersonic speeds. Unconfirmed reports and online lore suggest the TR-3B uses highly pressurized mercury accelerated by nuclear energy to produce a plasma that creates an anti-gravity field, allegedly allowing for speeds exceeding Mach 9.

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