NASA says evidence for 'Planet Nine' is mounting (Report)

Artist’s illustration of “Planet Nine,” a hypothesized world about 10 times more massive than Earth that may orbit far beyond Pluto.

 (Caltech/R. Hurt (IPAC))

We might not actually know how many planets are in our Solar System — and no, this isn’t a trick regarding Pluto’s status. For years, scientists have wondered if there might be a larger, planet-sized body lurking in or around the thick layer of debris called the Kuiper Belt, and now NASA is saying the evidence is hard to ignore.

The would-be planet, which would likely be a frigid place thanks to its position on the very outer edge of the system, hasn’t been directly spotted, but measurements of other known objects in the Kuiper Belt heavily suggest something is there. The only thing left to do is actually spot it, or verify that it doesn’t actually exist at all.

“There are now five different lines of…