this post was submitted on 25 Jun 2023
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It's probably a Quasar.
https://en.wikipedia.org/wiki/Quasar
IIRC, some (or most) emit radio waves periodically as well. Cool find, none-the-less.
Until 1932 when Radio Telescopes were invented and these phenomenons have been being observed ever since.
https://en.wikipedia.org/wiki/Radio_Telescopes#Early_radio_telescopes
Just because you don't know what it is doesn't mean it's aliens.