Jingszo !

Now, a US-based trio hunting this elusive world has instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

And the existence of this new kid on the block could challenge the Planet Nine theory, the researchers have calculated.

Named 2017 OF201, the new object is roughly 700 kilometers (430 miles) across, according to a preprint study, which has not been peer-reviewed, published online last week.

That makes it three times smaller than Pluto.

But it is still big enough to be considered a dwarf planet.