Ngôi sao sống bao lâu?
Các vì sao có tuổi thọ dài ngắn khác nhau, tùy thuộc vào độ lớn của chúng. Vì sao như mặt trời của chúng ta sống khoảng 10 tỷ năm, trong khi ngôi sao nặng gấp 20 lần như thế thì chỉ sống khoảng 10 triệu năm, bằng 1/1000.
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