Space and astronomy news
As students advance to higher and higher physics courses, they eventually learn that the simple Newtonian dynamics they learned about in early classes aren’t completely accurate models for understanding the universe. If things get too big or fast, they fall into the realm of relativity, or if they get too small, they get caught up in quantum mechanics. However, simple Newtonian dynamics does the trick for things ranging from how a baseball flies to how planets orbit the Sun.
Many lay people, and even many astronomers, believe that there is a Planet 9 out there. As proof, they point to the orbital mechanics of a class of Kuiper Belt Objects . Tracing these frozen asteroids throughout the solar system, it seems many of their movement could be explained if there were a giant planet about five times the size of Earth and about 500 times farther away from the Sun.From a pure data perspective, they are right.
MOND is particularly good at modeling the pull our galaxy’s core has on bodies in the solar system. For planets and asteroids closer to the Sun, our star has a much stronger gravitational stranglehold on those closer objects than on some farther away.However, as an object increases in distance from the Sun, the galactic core’s gravitational forces start to take control of its orbital path. Drs Brown and Mathur believe there are two manifestations of this extrasolar gravitational pull.
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