Planet Nine and six other baffling space mysteries scientists can't explain

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If Planet Nine is now at a distant point in its orbit, it could take thousands of years for it to circle back to a point where it's visible from Earth. "These things have been twisted out of the solar system plane with help from Planet Nine and then scattered inward by Neptune".

In October 2017, NASA released a statement saying that Planet Nine may be 20 times further from the Sun than Neptune is, going so far as to say "it is now harder to imagine our solar system without a Planet Nine than with one".

Although a recent study offers a different explanation for the tilted orbit of the TNOs - arguing that Planet Nine doesn't actually exist, as The Inquisitr recently reported - Brown remains "eternally optimistic" that someone will eventually find the elusive giant.

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Because of its vast distance from the sun and its non-reflective appearance, Planet 9 appears very dim.

Scientists now consider other other options to detect the planet. It's like the Loch Ness monster of planets - it might exist, or it might not, but scientists think they have evidence that something is out there. Scientists anticipate that this hypothetical planet shines in the millimeter part of the spectrum, which is between infrared light and microwaves, notes the Washington Post.

"The radius of the earth's orbit around the sun is about the space between my fingers", said Jason Kendall, an astronomer at William Patterson University.

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University of IL cosmologist Gilbert Holder is optimistic that the millimeter telescopes in Antarctica and Chile would be able to detect the Planet Nine today if it happens to stray across their search field.

That massive telescope can view a field in the sky about the size of 4,000 full moons at once.

Brown and colleague, Carnegie Institution for Science astronomer Scott Sheppard, now spearhead the search for the planet using the Subaru telescope in Hawaii. For instance, the planet could be hidden by the glare of a bright star or the light pollution in the Milky Way.

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Researchers say, if the orbit of the ninth planet is beyond the 1,000 AU limit of current telescopes, it could lie invisible for the next 1,000 years. At the same time, he noted that it can be practically invisible to existing observatories.