We have the mass of the sun, we have the radius of the sun so you can calculate the moment of inertia of the sun.

我们知道太阳的质量，太阳的半径,所以可以计算出,太阳的惯性是多少。

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If m is the mass of the sun, the radius of the event horizon is three kilometers.

视界的半径就是，3公里，若m是太阳的三倍重。

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Astronomers generally measure the size of stars in terms of the radius of our sun.

天文学家一般以太阳的半径为基本单位表征恒星的大小。

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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