Months after the Tongan volcanic eruption, the Antarctic sky has turned shades of purple due to the afterglow from the eruption. The Hunga Tonga-Hunga Ha'apai volcano erupted in January, triggering a tsunami. Following the eruption, aerosols made of sulphate particles, sea salt and water vapour circulated in the air, bending and scattering sunlight and creating a glow in the sky.