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For starters, the existence of repeating FRBs like the one captured last year could rule out some possible origins. These repeating signals flashed from the same spot in the sky (from an estimated 1.5 billion light-years away) six times over the course of several months. According to the study authors, this delayed repetition rules out "cataclysmic events" like supernovas as a likely source of the repeated blasts, as bursts from an exploding star would be expected to happen just once.
www.livescience.com...
from link Signals in space: Five theories on what they are
"It just seems completely inconceivable that there could be that many different alien civilisations all deciding to produce the same kind of signal in the same way - that just seems highly improbable."
from link Dr Ingrid Stairs
Fast Radio Bursts (FRBs): These millisecond-duration bursts of radio emission are extragalactic in origin but their source is still unknown. I am part of a team installing a powerful FRB detector on the upcoming CHIME telescope; we expect to see up to a few tens of FRBs per day and examine the brightest ones with high time resolution and polarimetry.
originally posted by: roadgravel
1.5 billion light years away. Even if it was a message, how much has changed in that length of time.
originally posted by: dreamingawake
That wouldn't be a reply to our signals sent out, unless it traveled differently?
originally posted by: Blue Shift
After all, "now" is "now" no matter where you are in the universe. I wonder what the sky would look like if we could see everything where it actually is.
Energy released when our universe bumps up against another universe?
originally posted by: roadgravel
a reply to: Gargoyle91
Could we trust a message from 100s or more of light years away? What could have changed with the sender while the message was traveling to here?