... 地球半径 earth radius; radius of the earth 辉球半径 sun radius 火球半径 fireball radius ...
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But there is a way to counter the increasing brightness of the Sun, the scientists believe - just increase the radius of the Earth's orbit!
BBC: Blue Marble Nasa
We call these stars supergiants and they are 20 times more massive than our own sun and so when these stars go supernova they expand to a radius of up to a billion miles, becoming the biggest and brightest star in the universe.
BBC: NASA's Swift satellite observes massive supernova stars
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