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Source/Further reading:
BBC, why has noone seen Planet Nine? https://www.bbc.com/future/article/20...
NASA, Planet 9 indepth:https://solarsystem.nasa.gov/planets/...
New Scientist, primordial black hole? https://www.newscientist.com/article/...
Smithsonian, Hunt for Planet Nine takes a hit: https://www.smithsonianmag.com/smart...
Scientific American, Planet Nine could be a mirage: https://www.scientificamerican.com/ar...
Search for Planet Nine blog: https://findplanetnine.blogspot.com/2...
Smithsonian, history of the hunt for Planet X: https://www.smithsonianmag.com/scienc...
The search for TransNeptunian Worlds: https://solarviews.com/eng/hypothet.h...
Nat Geo, the hunt for Planet Vulcan: https://www.nationalgeographic.com/sc...
1870s NYT article on Vulcan’s existence: https://timesmachine.nytimes.com/time... Nibiru myth: https://www.space.com/15551nibiru.html
Britannica, discovery of Neptune: https://www.britannica.com/place/Nept...
Geographics on Pluto: • Pluto: The Frozen World
Nemesis Star: https://www.space.com/22538nemesiss...
Sedna orbit and Planet Nine: https://www.astrobio.net/newsexclusi...
Mike Brown, Alan Stern rivalry: https://www.theguardian.com/science/2...
Finding mostdistant ever objects by looking for Planet 9: https://www.sciencealert.com/farfarou...
Durer’s Rhino: https://www.historytoday.com/archive/...