The climate-altering eruption came from the Zavaritskii volcano on an uninhabited island in the Pacific that once hosted a Soviet submarine base, according to a new study

Zavaritskii volcano in the Kuril Islands was responsible for the mysterious 1831 volcanic eruption that cooled the climate and turned the sun different colors, a new study finds.

Scientists Make Groundbreaking Discovery About a Volcanic Eruption That Almost Turned the Sun Blue Scientists solved the 200-year-old mystery of the location of a large volcanic eruption that exerted a massive volume of gases which blocked sunlight and made the sun look blue.

In the summer of 1831, people across the Northern Hemisphere experienced bizarre and unsettling phenomena: the sun appeared blue, purple, and even green, and temperatures dropped dramatically during what should have been the warmest months of the year.