In 2001, a team of scientists from Japan drilled a 122 meter ice core sample at the Dome Fuji station in Antarctica, an inland site in Antarctica. At a depth of about 50 meters, corresponding to the 11th century, they found three nitrogen oxide spikes, two of which were 48 years apart and easily identifiable as belonging to SN 1006 and SN 1054. The team speculates that the mysterious third spike may have been caused by another supernova, visible only from the southern hemisphere. (source: universetoday.com)
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