Comment Planet Nine coming soon (Score 1) 63
I got to see Mike Brown (@plutokiller) speak earlier this year. He said that if the Vera Rubin Observatory starts its principle mission October 1 as planned, it should detect Planet Nine by the end of the year. I guess that depends on its NSF-DOE funding holding up.
P.S., Brown's 2010 book "How I Killed Pluto and Why It Had It Coming" is a very enjoyable read.