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>inb4 "greys"
Not real.
It's classic mythological archetype formed by HG Wells in 'man in the millioneth year' then reimagined in other works, by various other creative 'artists' including Crowley who he knew. If Ayys are real, the case for them is 'cryptoterrestials' for which the late Mac Tonnies died of a heart attack in his sleep at the tender age of early 30s, before his book 'cryptoterrestials' could be printed.
To date, the Phobos incident, perhaps is the best evidence of something, among many intriguing events. Something or someone was on mars, both the USSR academy of Sciences and JPL by 1964 had detected flora seasonal changes on it's surface.