Morning Overview on MSN

A new find deepens the mystery of a hidden Planet Nine at the solar system’s edge

Two faint objects hiding in archival infrared sky maps now sit at the center of a growing scientific argument about whether a ...
Live Science on MSN

Astronomers discover new dwarf planet 'Ammonite' — and it could upend the existence of Planet Nine

A newly discovered dwarf planet called 'Ammonite' (2023 KQ14) has been spotted in the outer solar system, and it could be another nail in the coffin for the Planet Nine hypothesis.

What is Planet Nine, and where is it? Mystery of large hidden planet beyond Neptune explained

What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive undiscovered planet may exist in the outer Solar System. Although no telescope has ...

In 1776, the solar system only had 6 planets. Now, it has 8. Does it end there?

As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...