The title somewhat sounds like the image was taken in some random night but that is probably many years of data contributing to that image. They have a similar

The title somewhat sounds like the image was taken in some random night but that is probably many years of data contributing to that image. They have a similar image [1] from more than 20 years of data. The article is from 2010, they started collecting data in 1996, depending on how much the image predates the article this might be up to 14 years worth of data. According to this paper [2] they expect to observe about ten solar neutrinos per day. [1] https://www-sk.icrr.u-tokyo.ac.jp/en/sk/about/research/ https://www-sk.icrr.u-tokyo.ac.jp/en/sk/about/research/ [2] https://link.springer.com/article/10.1140/epjc/s10052-019-6796-2 https://link.springer.com/article/10.1140/epjc/s10052-019-67...