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How big is 參宿四(獵戶座 α)?
1.1 billion kilometers!
Betelguese 已經有幾百萬歲. 因為它這麼老, 預計會在未來一萬年內爆炸. 較小的恆星可 以存活幾兆年, 但參宿四較大所以老得快.
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