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Topic: Planet Nine

Artist's concept of the hypothetical Planet Nine (Caltech/R. Hurt [IPAC])

Did our solar system lose a planet?

Eric Schank
The 11-Jupiter-mass exoplanet called HD 106906 b, shown in this artist's illustration, occupies an unlikely orbit around a double star 336 light-years away. It may be offering clues to something that might be much closer to home: a hypothesized distant member of our solar system dubbed "Planet Nine." This is the first time that astronomers have been able to measure the motion of a massive Jupiter-like planet that is orbiting very far away from its host stars and visible debris disk. ( NASA/M. Kornmesser/ESA/Hubble)

Scientists may know how to find Planet 9

Nicole Karlis
The 11-Jupiter-mass exoplanet called HD 106906 b, shown in this artist's illustration, occupies an unlikely orbit around a double star 336 light-years away. It may be offering clues to something that might be much closer to home: a hypothesized distant member of our solar system dubbed "Planet Nine." This is the first time that astronomers have been able to measure the motion of a massive Jupiter-like planet that is orbiting very far away from its host stars and visible debris disk. ( NASA/M. Kornmesser/ESA/Hubble)

We just met Planet Nine's twin

Nicole Karlis
(Salon/Ilana Lidagoster)

Does Planet Nine exist?

Rachel Leah
(AP Photo/NASA Ames, SETI Institute, JPL-Caltech, T. Pyle) (AP)

Planet Nine or Planet Nought?

Matthew Rozsa
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