The observational constraints on a PBH in the outer Solar System significantly differ from the case of a new ninth planet.
"If conventional searches fail to find Planet Nine and the evidence for TNO anomalies continues to grow, the primordial black hole Planet Nine hypothesis will become a compelling explanation", the authors reflect. We advocate that rather than just looking for it in visible light, maybe looking for [Planet Nine] in gamma rays. All of these are theorized to have formed several hundred thousand years after the Big Bang; this is because black holes are now known to develop in the aftermath of supernova explosions and stars take at least that long to form and die.
The scientists behind the new study say that direct observations of the mysterious object - if astronomers can find it - could help determine whether it's a planet or black hole.
Astronomers have stated that a hypothetical Ninth planet, which can exist on the boundaries of the Solar system, in fact, may be the primary a black hole.
Many scientists believe that there's a large, unseen planet at the very edge of our solar system, due to the wobbly orbits of rocks beyond Neptune.
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According to the research published in the online science journal arXiv, the tiny black hole could be just the size of a wallet, but still have 10 times the mass of Earth.
Batygin and Brown suggested that Planet Nine could have formed in the same way as the gas giants we know well -Jupiter, Saturn, Uranus, and Neptune - starting as an ice core then grabbing all the gas around it. Researchers also talks about new ways to hunt down these ancient black holes that have 10 times the mass of Earth.
Researchers led by Professor James Unwin at the University of IL at Chicago suggest that a "more exciting" possibility might be that a black hole lurks at the edge of our solar system.
Planet Nine as initially thought to be an "Extreme Trans-Neptunian Object", because of its distance and size from the Sun.
For the new study, researchers looked at data on the six Kuiper Belt objects' freaky orbits and also incorporated recent observations about how light traveling through the solar system appears to be bending due to an object (or objects) that scientist haven't accounted for. The gravitational fields of these small objects, which could be primordial black holes or free-ranging planets, bend light from background stellar sources, producing a lensing signature that OGLE can detect.