12:30:8 
2023-06-18 
602
An astronomer expects the existence of a ninth planet in our solar system
There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, in order of distance from the sun.
Scientists have long assumed the existence of a ninth planet behind Neptune, in the outer region of the solar system, and have tried to find evidence of this hypothesis for about 20 years.
This hypothetical planet is temporarily known as Planet Nine, which is not believed to be a small body like Pluto or like many of the trans-Neptunian objects that have been discovered in recent years.
Detailed simulations were created to theorize about the properties the object might have in order to produce the observed effects, and the conclusion is that it must be a very large planet, four to eight times the mass of Earth.
It must also be very far from the sun: about 10 times the distance to Pluto, possibly more.
And if it exists, it will be considered a new type of planet, different from the other types that we currently know in the solar system.
Our planetary neighbors are mainly classified into two types. They are either small, rocky, solid-surfaced worlds (Mercury, Venus, Earth, and Mars) or gas giants (Jupiter, Saturn, Uranus, and Neptune).
Planet 9 falls somewhere between these categories. It could be what is known as a Super-Earth, a rocky planet larger than our own, or a sub-Neptunian, a gaseous world with less mass and slightly smaller than Neptune.
Scientists have located planets like this around other stars, but because we are so far away, we know very little about them, so the discovery of one in our solar system will open the door to a detailed study of a class of planets that is almost unknown today.
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