A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

In a thrilling development that challenges long-held assumptions about the outer reaches of our solar system, astronomers ...

The diameter of Pluto, meanwhile, is 2,377 km. Further observations, potentially using radio telescopes, are needed to determine the object's exact size. Cheng discovered the object as part of an ...

Pluto has become a beloved object in our solar system ever since the International Astronomical Union (IAU) reclassified it from a planet to a dwarf planet back in 2006 – a decision which has ...

At the very edge of our solar system, beyond the grasp of Neptune and even past the icy sprawl of Pluto’s domain, a new ...

NASA wrote in a blog post: "Surveys of planets around other stars in our galaxy have found the most common types to be “super Earths” and their cousins – bigger ... that we think we're seeing." ...

Fortunately, naming rights usually go to the ones who discovered it, and given the ongoing theme of Greek and Roman mythological gods, it's unlikely that it will stay as Planet X for too much longer.

Many of its distant cousins appear to “cluster” together ... That date is rich with coincidence. Pluto was discovered that very same year. And the Institute for Advanced Study, where Cheng ...

Scientists believe that they've discovered a new planet which may be ... it will stay as Planet X for too much longer. Advert While Pluto was infamously reclassified back in 2006, Planet X is ...