Researchers have discovered the origins of a 200-year-old volcanic eruption that ejected so much sulfur into the atmosphere that it changed the climate and made the sun look blue.
In 1831, the Northern Hemisphere climate cooled by an average of about 1.8 degrees Fahrenheit (1 degree Celsius), coinciding with reports of gloomy, bleak weather and the sun turning different colors. Scientists knew a massive eruption caused this strange event, but the volcano responsible has remained a mystery — until now.
