The Digital Press

Scientists searched for the hypothesized Planet Nine by comparing two far-infrared all-sky surveys taken 23 years apart to spot slow-moving objects in the distant solar system. They identified one promising candidate that requires follow-up observations to confirm its orbit.

Why it matters: Detecting Planet Nine could explain unusual Kuiper Belt object clustering and reshape understanding of the outer solar system.

The big picture: Using IRAS and AKARI surveys enables detection of faint, slow-moving distant planets through their thermal emission over decades.

Stunning stat: The search narrowed candidates to 13 pairs based on expected motion over 23 years and distance between 500-700 AU.

The stakes: Without follow-up, the candidate’s orbit remains unknown, delaying confirmation of Planet Nine’s existence and its solar system impact.