There might be a ninth planet. It turns out it’s not just the ancient alien folks who are looking for an orbit of the fabled planet. Here’s more from Astronomy Now:
For the past several years, astronomers have been searching for an unseen planet beyond the orbit of Pluto, a presumed world with 10 times the mass of Earth that could be responsible for the seemingly clustered orbits of small Trans-Neptunian Objects, or TNOs, in the extreme outer solar system. So far, “Planet 9” has eluded detection.
Dealing a possible blow to the theorised planet, a team of researchers led by Kevin Napier of the University of Michigan suggests selection bias may have played a role in the original justification for Planet 9.
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