For any object, there is a critical radius, called the Schwarzschild radius, at which its mass will form a black hole.

对于任何一个物体，都存在一个被称为史瓦西半径的临界半径，在这个半径以内的质量将形成一个黑洞。

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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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The combined observations showed that both planets are about 0.8 times the radius of Jupiter, or slightly smaller than Saturn, and their masses are about 0.25 and 0.17 times the mass of Jupiter.

总体的观测结果证明，这两颗行星大约是木星半径的0.8倍，略小于土星，它们的质量大概是木星的0.25倍和0.17倍。

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We can make some substitutions here using some of the derivation on the previous board which will give us the Planck constant divided by 2 pi mass of the electron times the Bohr radius.

在这里我们也可以,用我以前在黑板上写过的一些词来取代它,得到的是普朗克常数除以2π电子质量,再乘以波尔半径。

麻省理工公开课 - 固态化学导论课程节选

n So the velocity is given by this product of the quantum number n Planck constant 2 pi mass of the electron time the radius of the orbit, which itself is a function of n.

速度是量子数,普朗克常数2π乘以轨道半径的值,它自身也是n的函数。

麻省理工公开课 - 固态化学导论课程节选

To compare alien planets, Dr. Mendez at the Planetary Habitability Laboratory and his colleagues are creating an Earth Similarity Index that ranks worlds by their resemblance to our own planet, on a scale from zero to one, based on their mass, radius, density and surface temperature.

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Both were the subject of a massive manhunt in Watertown, Mass in the wee hours of Friday morning, where police sealed off a 20-block radius where the suspects were believed to be holed up and warned the public to stay indoors.

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