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• 은하계1년; 태양이 은하수 중심을 한 바퀴 도는데 2억2천5백만 년이 걸린다 The Sun is 4.6 billion years old and has completed only 20 of these laps since it first ignited. The last time it was at this exact point in its orbit, dinosaurs had not yet appeared on Earth. blog.naver.com · 2026.06.17