Over the years, astronomers have been constantly searching for the existence of the 9th planet in the Solar System. But the results received seem to be zero.
By 2020, human knowledge of astronomy will stop at the region around Neptune orbit, the 8th and farthest star from the Sun in the Solar System.
From then on, everything was very small and far, making the process of astronomical research limited, partly making it difficult for the astronomer to find the 9th planet.
There are still many mysteries in outer space waiting for human answers. (Photo: Caltech / R. Hurt).
Besides Pluto discovered in 1930, our knowledge of the Solar System at that time was still quite limited.
It was not until 1992, when astronauts first discovered the Kuiper belt object, a frozen remnant from the formation of the Solar System, that it was orbiting the Solar System like a black hole beyond Neptune, Humans have just discovered many objects in outer space and started studying them.
In 2003, astronomers discovered Sedna, an extreme transboundary object (eTNO) . Despite being nearly half the size of Pluto, Sedna has an eccentric orbit, ranging from 76 AU to more than 900 AU (the astronomical unit calculated by the distance from the Sun to the Earth) during 11,000 years, double compared to the length of human history.
Recently, astronomy research groups have begun to take an interest in eTNO. Specifically, six newly discovered objects have elliptical orbits and they all come together.
Imagine you pick up any flower from a field of flowers. As usual, you still think the petals will be distributed around, but what if they all gathered together?
Sedna's orbit is unbelievably strange to be able to move freely without being pushed out of the Solar System. (Photo: Wikipedia).
The same thing happens with eTNOs. It is unreasonable to say that their trajectories together are accidental. In order to properly explain this phenomenon, scientists consider this may be a sign of the existence of the 9th planet.
In the past, because astronomers could not decipher the orbits of Uranus, astronomers stumbled upon Neptune. Similarly, the relationship between Sedna's orbit and exotic eNTOs could give similar results for the existence of the 9th planet.
However, when the 9th planet began to gain widespread interest as a scientific subject, no image or data ever recorded its presence. However, not only except the possibility that the 9th planet exists out there but because it is so far from the Earth we can hardly detect.
On the other hand, some astronomers think that eNTOs are nothing special. They depend on how the scientist designs and conducts discovery. They can easily detect many eTNOs because they are not hidden by other mysterious objects in space. Because of the inability to study details, scientists cannot explain them clearly.
Moreover, it is difficult to accept the existence of the 9th planet in the way we are now understanding the formation of the Solar System. Of course, astronomers will continue to study and rearrange the order of the Solar System when discovering new planets, as well as the ninth planet remains an unsolved mystery.