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A mysterious Planet Nine, J1249+36 is one of just a handful of hypervelocity stars identified in the Milky Way

"hypervelocity" stars are extremely rare, but we've just spotted a particularly special example. 

A star named CWISE J124909+362116.0 (J1249+36 for short) not only exceeds the galactic escape with a velocity at around 600 kilometers (373 miles) per second, it's a very rare type of tiny, ancient, main sequence star called an L subdwarf, which happens to also be one of the oldest in the Milky Way.

First spotted by citizen scientists combing through telescope data for signs of the – and although far from the fastest we've seen, it represents something of a challenge to astronomers; namely, how did it get so breathtakingly fast?

Astronomers has Discover Mysterious New Objects?. Beyond Edge of Solar System.
Distance distribution: Kuiper Belt Objects discovered by HSC on Subaru Telescope. 

The horizontal axis represents distance from Sun to the objects, measured in astronomical units (au: 1 au is distance between Earth to Sun). It vertical axis represents number objects. Notice drop in  objects between approximately 55 au & 70 au. Such gap had not reported in other observations. Credit: Wesley Fraser.

Dr. Wes Fraser: National Research Council of Canada, a co-investigator on the New Horizons mission science team, study’s lead author, explains, “Our Solar System’s Kuiper Belt long appeared to be very small in comparison with many other planetary systems, but our results suggest idea might have arisen due to an observational bias.” He adds, “Maybe, if result confirmed, our Kuiper Belt isn’t all small & unusual after compared to around other stars.”
https://scitechdaily.com/astronomers-dis...ar-system/