Why won't mercury be swallowed up by the sun?

Mercury is a smaller planet among the eight planets, and it is also very close to the sun, so some people ask why Mercury was not swallowed by the sun. Are small celestial bodies directly related to being swallowed up by the sun at close range? Let's reveal the answer by constellation knowledge! Let's have a look!

Why won't mercury be swallowed up by the sun? Compared with other planets, Mercury is indeed smaller and still a planet close to the sun, but it is not directly related to whether Mercury will be swallowed up by the sun. Not that the celestial body is small, but that it will be swallowed up by the sun when it is close to the sun. You know, this year, the Parker solar probe launched by NASA will be only 6.9 million kilometers away from the sun, which is much closer than the distance between mercury and the sun (58 million kilometers on average). Moreover, the mass of Parker solar probe is only a few hundred kilograms, which is much lighter than Mercury. Even so, the Parker solar probe will not fall into the sun.

So, why on earth is Mercury not swallowed up by the sun?

The mass of the sun is very large, and its strong gravity will attract all the celestial bodies in the solar system. But at the same time, celestial bodies move around the sun at a corresponding speed to avoid falling into the sun. Mercury orbits the sun at an average speed of 47.4 kilometers per second, so the sun's gravity will not pull water. The closer a celestial body is to the sun, the faster its orbital speed will be, so as to avoid falling into the sun.

Parker solar probe is so close to the sun that it will not be swallowed up, precisely because it also orbits the sun at a corresponding speed, and the speed at perihelion will be as high as 690000km/h, that is,192 km/s. Similarly, satellites will not fall to the earth because they rotate around the earth at a suitable speed.

In addition, according to Newton's law of universal gravitation and the law of circular motion, if mercury is replaced by other planets, as long as their orbital speed is still 47.4 km/s, they can orbit around the sun in the original orbit of mercury, which has nothing to do with the mass of the planet itself (as long as the mass is much smaller than the sun).

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