https://www.dailymail.co.uk/sciencetech/article-6576963/The-sun-turn-crystal-ball-10-billion-years-time.html?ito=social-twitter_mailonline
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The sun will turn to ROCK in 10 billion years’ time: Star will burn the last of its nuclear energy and become a ‘crystal ball’ 200,000 times denser than Earth when it dies

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Source: みら速