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And HN strikes again: A possible "Planet Nine" in Earth's solar system would orbit far beyond Neptune

• InclinedPlane 9y ago
  There are actually two hypothesized planets orbiting beyond Neptune. Planet Nine is pretty well accepted as a reasonable theory in the scientific community, sufficient enough to dedicate millions of dollars worth of observing time on some of the biggest telescopes on Earth to try to look for it. Planet Nine is expected to be around 10 Earth masses and have an orbit that reaches out to several hundred times farther from the Sun than Earth (AUs). The evidence pointing to a "Planet 10" is not nearly as strong but intriguing nonetheless, it's hypothesized to be a roughly Earth mass planet (or less) orbiting only maybe 2-3x as far from the Sun as Neptune