Renegade Game Studios Renegade Game Studio | The Search for Planet X | Board Game | Ages 13+ | 1-4 Players | 60 Minutes Playing Time

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Clyde W. Tombaugh (1946). "The Search for the Ninth Planet, Pluto". Astronomical Society of the Pacific Leaflets. 5 (209): 73–80. Bibcode: 1946ASPL....5...73T. Lowell's first search focused on the ecliptic, the plane encompassed by the zodiac where the other planets in the Solar System lie. Using a 5-inch photographic camera, he manually examined over 200 three-hour exposures with a magnifying glass, and found no planets. At that time Pluto was too far above the ecliptic to be imaged by the survey. [18] After revising his predicted possible locations, Lowell conducted a second search from 1914 to 1916. [18] In 1915, he published his Memoir of a Trans-Neptunian Planet, in which he concluded that PlanetX had a mass roughly seven times that of Earth—about half that of Neptune [20]—and a mean distance from the Sun of 43AU. He assumed PlanetX would be a large, low-density object with a high albedo, like the giant planets. As a result, it would show a disc with diameter of about one arcsecond and an apparent magnitude between 12 and 13—bright enough to be spotted. [18] [21]

a b TJ Sherrill (1999). "A Career of Controversy: The Anomaly of T. J. J. See". Journal for the History of Astronomy. 30: 25–50. Bibcode: 1999JHA....30...25S. doi: 10.1177/002182869903000102. S2CID 117727302. Both Brown and Sheppard noted that there are already surveys of the sky looking for these kinds of object, and anything more than about 130 miles across at the distance they are positing would have been seen by now, perhaps even by a high-end amateur telescope. a b "The Discovery of Pluto". Monthly Notices of the Royal Astronomical Society. 91 (4): 380–385. February 1931. Bibcode: 1931MNRAS..91..380.. doi: 10.1093/mnras/91.4.380. Although its mission did not involve a search for PlanetX, the IRAS space observatory made headlines briefly in 1983 due to an "unknown object" that was at first described as "possibly as large as the giant planet Jupiter and possibly so close to Earth that it would be part of this Solar System". [49] Further analysis revealed that of several unidentified objects, nine were distant galaxies and the tenth was " interstellar cirrus"; none were found to be Solar System bodies. [50] Iorio, Lorenzo (2017). "Is the Recently Proposed Mars-Sized Perturber at 65–80 AU Ruled Out by the Cassini Ranging Data?". Frontiers in Astronomy and Space Sciences. 4: 28. arXiv: 1407.5894. Bibcode: 2017FrASS...4...28I. doi: 10.3389/fspas.2017.00028. S2CID 26844167.Achenbach, Joel; Feltman, Rachel (2016-01-20). "New evidence suggests a ninth planet lurking at the edge of the solar system". The Washington Post . Retrieved 2016-01-20.

a b "IAU 2006 General Assembly: Resolutions 5 and 6" (PDF). International Astronomical Union. 2006-08-24.Napier, J. K.; etal. (2021). "No Evidence for Orbital Clustering in the Extreme Trans-Neptunian Objects". The Planetary Science Journal. 2 (2): 59. arXiv: 2102.05601. Bibcode: 2021PSJ.....2...59N. doi: 10.3847/PSJ/abe53e. S2CID 231861808. In essence, the game is an extended Logic Problem puzzle wrapped up into a board game. So, if logic is your thing, then you’re likely to get a lot out of Planet X. If not, it might leave you a little cold. Asteroids: There are 4 asteroids total, and every asteroid is adjacent to at least one other asteroid a b P.S. Lykawka & T. Mukai (2008). "An outer planet beyond Pluto and the origin of the trans-Neptunian belt architecture". Astronomical Journal. 135 (4): 1161–1200. arXiv: 0712.2198. Bibcode: 2008AJ....135.1161L. doi: 10.1088/0004-6256/135/4/1161. S2CID 118414447. Helhoski, Anna. "News 02/16/11 Does the Solar System Have Giant New Planet?". The Norwalk Daily Voice . Retrieved 10 July 2012.