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Kordylewski cloud is sometimes thought of as the second moon.

Kordylewski cloud is sometimes thought of as the second moon. 

In this case, we are not talking about the ball form of the moon, and actually, those moons are very small and the size of them might be less than a kilometer. But the thing is that near the Earth is an object, what is known as the Kordylewski cloud (1). That thing is sometimes mistakenly claimed as the planet, and if the telescope is dirty or the weather is not good, that kind of object might be thought of as the planet. 

When we are thinking about the second moon of the Earth, there might be many asymmetrical objects near Earth, and maybe we can call every single natural object, what is orbiting our planet as "moon". And this is the reason, why people who are talking about the second moon are not wrong. But how we are defining the moon? Are only symmetrical objects what are orbiting planets "moons"? Here we must notice, that also symmetrical objects might be really small, and this makes them fascinating.  

If we think every particle, what are orbiting planets as "moon", we might understand that Saturn and other Giant planets have thousands of moons. In this case, we are thinking of every single dust bite as the moon. And if we are thinking that the moon would object, what causes tide, we are facing the thing that also dust clouds can cause tide, because of those small sand particles common gravity force would make the same effect as the solid particle. 

But in 1997 the scientists found the one larger object near Earth (2), which made people think about the possibility that there might be another bigger moon. But there is a possibility, that the astronomers, who are claimed to see that kind of things are not made mistakes. They might see some asteroids like Icarus (3), whar are orbiting the sun very elliptic trajectory. 

And many of those small asteroids have not even names. So why that object, what is called the "second moon of Earth" have not seen earlier? There might be a simple reason for that thing. The Earth can also capture other particles, and sometimes asteroids are turning to orbit trajectory of planets. But if the object is really small, and the distance is big, the dust clouds can also pull that kind of small objects away from orbiting trajectory. If we think that way, the Earth might be lost many small orbiters during history. 

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