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Source/Further reading:
BBC, why has no-one seen Planet Nine? www.bbc.com/future/article/20...
NASA, Planet 9 in-depth:solarsystem.nasa.gov/planets/...
New Scientist, primordial black hole? www.newscientist.com/article/...
Smithsonian, Hunt for Planet Nine takes a hit: www.smithsonianmag.com/smart-...
Scientific American, Planet Nine could be a mirage: www.scientificamerican.com/ar...
Search for Planet Nine blog: findplanetnine.blogspot.com/2...
Smithsonian, history of the hunt for Planet X: www.smithsonianmag.com/scienc...
The search for Trans-Neptunian Worlds: solarviews.com/eng/hypothet.h...
Nat Geo, the hunt for Planet Vulcan: www.nationalgeographic.com/sc...
1870s NYT article on Vulcan’s existence: timesmachine.nytimes.com/time... Nibiru myth: www.space.com/15551-nibiru.html
Britannica, discovery of Neptune: www.britannica.com/place/Nept...
Geographics on Pluto: • Pluto: The Frozen World
Nemesis Star: www.space.com/22538-nemesis-s...
Sedna orbit and Planet Nine: www.astrobio.net/news-exclusi...
Mike Brown, Alan Stern rivalry: www.theguardian.com/science/2...
Finding most-distant ever objects by looking for Planet 9: www.sciencealert.com/farfarou...
Durer’s Rhino: www.historytoday.com/archive/...