Uncovering the Mystery of Potential Mars-Sized KBOs

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The discussion centers on the possibility of undiscovered Mars-sized Kuiper Belt Objects (KBOs) that could be located far from detection. It highlights that previous searches, like the 'Planet X' hunt, primarily focused on the ecliptic plane, while new infrared telescopes have broader coverage and sensitivity. This suggests that any potential KBOs would likely be located at significant distances or have steep orbital inclinations. Participants express optimism that such objects could be identified in the coming years. Additionally, there is a belief that there is still potential for discovering nearby brown dwarf stars.
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Could one exist that size that we don't know about?
 
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It would have to be *really* far away to have avoided detection by now.
 
IIRC, the 'Planet X' hunt covered much of the plane of the ecliptic, but the new IR telescopes cover a wider field with greater sensitivity: If there is anything, it is waaay out and/or steeply inclined.

So, one or more could show up in the next couple of years.

In a related hunt, IMHO, there's still a chance of finding super-cool 'Brown Dwarf' stars within a parsec...
 

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