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No need for Planet Nine? Astronomers say an invisible pane of icy space might explain things



Some astronomers have suspected for years that a planet is out of Neptune's orbit in the vastness of our solar system – a mysterious, giant planet called "Planet Nine." This theory is based on the strange orbital motions of the small, distant world worlds, which behave like an invisible object, influence their movements. Now, a group of researchers have found another way to explain these orbital curiosities. In a study published in the Astronomical Journal on January 21, the team suggests that instead of a large object, our solar system has an enormous disk of small, icy space rock that influences the orbits. With the exception of Planet Nine, this record has not been recognized yet.

Does Planet Nine exist?

After Neptune's orbit in a region known as the Kuiper Belt, there are thousands of small worlds called Trans-Neptunian Objects (TNOs). They are planetesimals that never became planets ̵

1; remnants of the first days of our solar system. And although this region may have once been flush with the space rocks, astronomers believe that the vast majority of these objects were ejected from the mass of the outermost planets in the early days of our solar system.

And for the remaining objects scientists know that the largest planets of the solar system still have an impact on orbit. Recently, however, dozens of large TNOs have been observed in strangely focused orbits. This has led researchers to assume that the large gravitational force of a ninth planet, which weighs ten times the mass of the Earth, could affect the orbits of these small, distant objects.

Now, however, a group of researchers from The University of Cambridge and the American University of Beirut say that instead of a gigantic planet, these gravitational forces could be the work of a disk of small objects whose mass is 10 times the mass the earth is. 19659003] The idea of ​​a plate that could eliminate the explanation of a giant Planet Nine is not a brand new concept. However, this new work models the interactions between the objects in our solar system and this hypothetical disk more comprehensively than ever before, the team says. "Our work is the first attempt to attempt a serious confrontation between the dynamics that sustain the hypothetical massive disk and observations, showing remarkable consistency (and some limitations)," said Jihad Touma, co-author of the American University of Beirut in an e-mail.

"We argue in our article why a massive disk in these remote parts of the solar system is not as disgusting as some theoreticians who support it by extrapolating from observational surveys," he added.

What is beyond Neptune?

"Planet Nine's Nine Hypothesis is intriguing, but if the ninth planet exists, it has so far avoided detection," co-author Antranik Sefilian of the University of Cambridge said in a statement. "We wanted to know if there is another, less dramatic and perhaps more natural reason for the unusual orbits that we see in some TNOs. We thought, instead of admitting a ninth planet, and then worrying about its formation and unusual orbit, why not just consider the gravity of small objects that represent a disk beyond the orbit of Neptune, and see what they do to us does?

To arrive at their conclusion, the researchers modeled TNOs with the influence of the largest planets in our solar system on gravity and a large disk after Neptune. The team found that in this configuration the gravity of the known planets in combination with the large disk was sufficient to explain the strangely concentrated orbits of the 30 TNOs observed in such groups. With this model, the team was also able to determine the roundness of the disk, the range of possible masses that can be contained in it, and how gravity will shift over time. Emagazine.credit-suisse.com/app/art…2934 & lang = DE If you could explain the bundled trajectories of 30 TNOs, they acknowledge that the Case is not completed yet, since neither Planet Nine nor this disc was directly observed. "It's also possible that both things could be true – there could be a massive disk and a ninth planet," said Sefilian. "With the discovery of each new TNO, we gather more evidence that could help explain their behavior."


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