New Delhi, Aug. 23 -- A new study suggests our solar system may be hiding yet another mysterious world. Researchers believe an Earth-sized planet, nicknamed Planet Y, could be lurking far beyond Neptune, subtly tugging at icy objects on the solar system's edge, the New Scientist reported.

The research, published on preprint server arXiv, comes from Amir Siraj and Christopher F. Chyba of Princeton University, along with astrophysicist Scott Tremaine of the Institute for Advanced Study. Their work focuses on unexplained orbital tilts observed in the Kuiper Belt-- a distant region filled with icy bodies, including dwarf planet Pluto.

Scientists have long speculated about Planet Nine-- a giant world estimated to be 10 times Earth's mass and...