Why Jupiter did not become a star?

As an expert in astrophysics, I can explain why Jupiter did not become a star. The key factor that determines whether a celestial body becomes a star is its mass. Stars, like our Sun, are massive enough to generate the necessary pressure and temperature at their cores to sustain nuclear fusion, the process by which hydrogen atoms combine to form helium and release energy in the form of light and heat.

Jupiter, the largest planet in our solar system, is composed mostly of hydrogen and helium, just like the Sun. However, despite its size, Jupiter's mass is not nearly large enough to initiate the process of nuclear fusion in its core. To become a star, Jupiter would need to be about 80 times more massive than it currently is. With its current mass, the pressures at Jupiter's core are insufficient to overcome the conditions required for fusion to occur.

Here's the translation in Chinese:

作为天体物理学领域的专家，我可以解释为什么木星没有变成一颗恒星。决定一个天体是否成为恒星的关键因素是它的质量。像我们的太阳这样的恒星质量足够大，能够在其核心产生必要的压力和温度，以维持核聚变，即氢原子结合形成氦并释放光和热的过程。

木星，我们太阳系中最大的行星，主要由氢和氦组成，就像太阳一样。然而，尽管木星体积庞大，但其质量远远不足以在其核心启动核聚变过程。要成为一颗恒星，木星的质量需要是目前的大约80倍。以木星目前的质量，其核心的压力不足以克服发生聚变所需的条件。

"Jupiter is called a failed star because it is made of the same elements (hydrogen and helium) as is the Sun, but it is not massive enough to have the internal pressure and temperature necessary to cause hydrogen to fuse to helium, the energy source that powers the sun and most other stars.