Researchers have determined this based on a microscopic analysis of quartz crystals in pumice from the Bishop Tuff in California, the site of a super-eruption 760,000 years ago.
Supernovas are a class of violently exploding stars that become super bright after eruption.
超新星是一类剧烈爆炸的恒星，爆发之后它变得极为明亮。
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This image shows the eruption of a galactic "super-volcano" in the massive galaxy M87, as witnessed by NASA's Chandra X-ray Observatory and NSF's Very Large Array (VLA).