Rare Blue Supermoon Illuminates Night Skies Across the Globe
A blue supermoon, the second full moon in August, occurred on Wednesday, appearing bigger and brighter than usual. A supermoon happens when the full moon coincides with the perigee, making it appear larger and brighter. Supermoons occur every three or four months, while blue moons, which happen every two or three years, are even rarer. Blue supermoons occur once every 10 years or so, with the last one in 2018 during a lunar eclipse. The next blue supermoons will occur in 2037.