The Solar System's Greatest Mystery May Finally Be Solved!

Scientists are using a new approach to find the mysterious - if it exists - Planet Nine by hunting for its heat signature instead of reflected light. Using data from Japan's AKARI space telescope, a team of researchers identified two promising candidates using their thermal detection method which is more effective than optical searches alone. But could these distant heat sources finally prove the existence of our Solar System's most elusive world, or will they turn out to be yet another false alarm in the decades long search?

Jun 20, 2025 - 13:20
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The Solar System's Greatest Mystery May Finally Be Solved!

Artist's impression of Planet Nine as an ice giant eclipsing the central Milky Way, with a star-like Sun in the distance. Neptune's orbit is shown as a small ellipse around the Sun. (Credit : Nagual Design)

Scientists are using a new approach to find the mysterious - if it exists - Planet Nine by hunting for its heat signature instead of reflected light. Using data from Japan's AKARI space telescope, a team of researchers identified two promising candidates using their thermal detection method which is more effective than optical searches alone. But could these distant heat sources finally prove the existence of our Solar System's most elusive world, or will they turn out to be yet another false alarm in the decades long search?