Scientists reported Wednesday, Jan. 20, 2016, they finally have "good evidence" for Planet X, a true ninth planet on the fringes of our solar system. (R. Hurt/Infrared Processing and Analysis Center/Courtesy of California Institute of Technology via AP …

It used to be that there were nine planets in our solar system. Although some people claimed that somewhere, out there, was a mysterious tenth planet called “Planet X.” In 2006, the IAU reclassified Pluto, in a hotly contested move that left the solar …

“This is not, however, the detection or discovery of a new planet. It's too early to say with certainty there's a so-called Planet X. What we're seeing is an early prediction based on modeling from limited observations. It's the start of a process that …

This artistic rendering provided by California Institute of Technology shows the distant view from Planet Nine back towards the sun. The planet is thought to be gaseous, similar to Uranus and Neptune. Hypothetical lightning lights up the night side …

A day after news broke that a potential planet lurked in the abyss of the solar system, resident and local science teacher James Keating said his lesson on the Doppler effect gave way to curious questions from his Marblehead High School astronomy students.

New evidence points to giant 9th planet on solar system edge · New evidence points to giant 9th planet on solar system edge. Scientists say they finally have "solid evidence" for Planet X, a true ninth planet on the fringes of our solar system. The …

This new planet, variously nicknamed Planet Nine, Planet X and Planet Phattie (by the two discoverers, Mike Brown and Konstantin Batygin), has not actually been seen yet because it's so far away. Its closest approach to the sun, the astronomers say, …

Pluto was added in 1930, following a search for a larger “Planet X”, but was demoted to an ice dwarf planet in 2006. Many Kuiper belt objects have also been observed, with at least one of them, Eris, more massive than Pluto (which eventually forced the …

Although Pluto had its title as the ninth planet striped away in 2006, there might be hope for a new planet to take its place. The California Institute of Technology announced on Wednesday, Jan. 20 that they have evidence of a new giant, icy planet in …

Sepasang astronom dari Caltech University, Mike Brown dan Konstantin Batygin baru saja mengumpulkan sejumlah bukti bahwa ada planet kesembilan di batas luar tata surya. Berdasarkan dua astronom tersebut, planet yang disebut sebagai 'Planet X' ini …