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, an enormous volcanic eruption spewed sulfur gas into Earth’s atmosphere. The particles scattered sunlight, making our star appear green, purple and blue. Its rays struggled to reach the planet’s surface,

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.