Artist's concept of a hypothetical planet orbiting far from the Sun. Almost a decade after astronomers proposed the existence of Planet 9, an unseen extra planet in the distant reaches of the solar ...
Far beyond Neptune, something heavy appears to be tugging on the outer solar system, bending the paths of distant icy worlds in ways gravity alone should be able to explain. Planet 9, still invisible ...
Scientists examined infrared space surveys to narrow down candidates for Planet 9. Planet 9 would be so far from the Sun that it is just not illuminated by much sunlight. The two space surveys, ...
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