Is There a Fourth Neutrino Out There in the Universe?

I thought Joachim Kopp&#x27;s article at <a href="https:&#x2F;&#x2F;physics.aps.org&#x2F;articles&#x2F;v11&#x2F;122" rel="nofollow">https:&#x2F;&#x2F;physics.aps.org&#x2F;articles&#x2F;v11&#x2F;122</a> was an even better explanation in some ways. It was buried as a link in the middle of the medium.com article.

I wonder if solar neutrino detection could be done on a satellite heading towards the sun. Seems like the signals may vary over distance from the sun (guessing here) perhaps providing some insight.

Please note: Unrelated to article content.<p><a href="https:&#x2F;&#x2F;i.imgur.com&#x2F;htxpRh7.jpg" rel="nofollow">https:&#x2F;&#x2F;i.imgur.com&#x2F;htxpRh7.jpg</a><p>Medium&#x27;s viewport is now about an inch tall on my phone, unless I carefully click 3 different 1sqmm X&#x27;s. That&#x27;s... Gross.