A planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto, according to new research. Too distant to be easily spotted by Earth-based telescopes, the unseen ...

The Scattered Disc is a group of icy objects in the outer reaches of the solar system. By distance, portions of the Scattered Disc overlap with the Kuiper Belt; however, ...

Most were left ostracized in what Madigan calls a “primordial scattered disk” beyond the territory of present-day Pluto. And she suggests that there may be much more mass in the disk than ...

The unseen planet would be too far away to perceptibly perturb the motions of Earth and the other inner planets, but close enough to the scattered disc objects to sway them. [ The True Stories of ...