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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But don't get too excited, planet fans. The Swedish team got their wish, and other astronomers reacted almost immediately to the online paper with largely skeptical takes. Chang, Kenneth (20 January 2016). "Ninth Planet May Exist Beyond Pluto, Scientists Report". The New York Times . Retrieved 22 January 2016.

Players should sit so that they are right in front of one of the symbols; this is important for game setup. It is also helpful to get the score sheet which matches your symbol. If you match, the board on your sheet will cleverly be in the same orientation as what you see on the table in front of you. This will make it easier for you to take notes in the appropriate spaces and to more clearly see things. In addition to the note sheet, each player gets a screen with which to hide their notes. They also get a set of 12 theory tokens and 2 target tokens. Again, the endgame is triggered when a player successfully locates Planet X. All players who are behind the Planet X finding player get one more endgame action – they can either submit additional theories (one theory if they are 1-3 sectors behind the Planet X finder’s token or two theories if they are 4-5 sectors behind) OR they can take their own attempt to locate Planet X. Myles Standish (1992-07-16). "Planet X– No dynamical evidence in the optical observations". Astronomical Journal. 105 (5): 200–2006. Bibcode: 1993AJ....105.2000S. doi: 10.1086/116575.

Score: 8/10

L. Iorio (2014). "Planet X revamped after the discovery of the Sedna-like object 2012 VP113?". Monthly Notices of the Royal Astronomical Society: Letters. 444: L78–L79. arXiv: 1404.0258. Bibcode: 2014MNRAS.444L..78I. doi: 10.1093/mnrasl/slu116. S2CID 118554088.

a b Batygin, Konstantin; Brown, Michael E. (20 January 2016). "Evidence for a distant giant planet in the Solar system". The Astronomical Journal. 151 (2): 22. arXiv: 1601.05438. Bibcode: 2016AJ....151...22B. doi: 10.3847/0004-6256/151/2/22. S2CID 2701020. 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. 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. Survey for an object (? Time) – Decide which object you want to look for and choose a number of sectors in which to search (e.g., Asteroids in sectors 1-6). The app will tell you how many of those objects are in your selected area. a b Lee Billings (2015). "Astronomers Skeptical Over "Planet X" Claims". Scientific American . Retrieved 2016-01-22.

Contributors

NASA's Solar System Exploration: Multimedia: Gallery: Pluto's Symbol". NASA. Archived from the original on 2006-10-01 . Retrieved 2007-03-25.

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. Some of these include extremely close stars, such as one located only 20 light-years away in the constellation Norma. A study that looked at WISE data last year found a pair of brown dwarfs just 6.5 light-years from Earth, making it the closest star system discovered in almost 100 years. Musotto, Susanna; Varadi, Ferenc; Moore, William; Schubert, Gerald (2002). "Numerical Simulations of the Orbits of the Galilean Satellites". Icarus. 159 (2): 500–504. Bibcode: 2002Icar..159..500M. doi: 10.1006/icar.2002.6939. Using modern data on the anomalous precession of the perihelia of Saturn, Earth, and Mars, Lorenzo Iorio concluded that any unknown planet with a mass of 0.7 times that of Earth must be farther than 350–400AU; one with a mass of 2 times that of Earth, farther than 496–570AU; and finally one with a mass of 15 times that of Earth, farther than 970–1,111AU. [100] Moreover, Iorio stated that the modern ephemerides of the Solar System outer planets has provided even tighter constraints: no celestial body with a mass of 15 times that of Earth can exist closer than 1,100–1,300AU. [101] However, work by another group of astronomers using a more comprehensive model of the Solar System found that Iorio's conclusion was only partially correct. Their analysis of Cassini data on Saturn's orbital residuals found that observations were inconsistent with a planetary body with the orbit and mass similar to those of Batygin and Brown's Planet Nine having a true anomaly of −130° to −110°, or −65° to 85°. Furthermore, the analysis found that Saturn's orbit is slightly better explained if such a body is located at a true anomaly of 117.8° +11°

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Lowell's sudden death in 1916 temporarily halted the search for PlanetX. Failing to find the planet, according to one friend, "virtually killed him". [25] Lowell's widow, Constance, engaged in a legal battle with the observatory over Lowell's legacy which halted the search for PlanetX for several years. [26] In 1925, the observatory obtained glass discs for a new 13in (33cm) wide-field telescope to continue the search, constructed with funds from Abbott Lawrence Lowell, [27] Percival's brother. [18] In 1929 the observatory's director, Vesto Melvin Slipher, summarily handed the job of locating the planet to Clyde Tombaugh, a 22-year-old Kansas farm boy who had only just arrived at the Lowell Observatory after Slipher had been impressed by a sample of his astronomical drawings. [26] Ernest W. Brown (1931). "On a criterion for the prediction of an unknown planet". Monthly Notices of the Royal Astronomical Society. 92: 80–100. Bibcode: 1931MNRAS..92...80B. doi: 10.1093/mnras/92.1.80. In January 2016, Konstantin Batygin and Michael E. Brown published their “Planet Nine” hypothesis. Using a computer model, they showed that a distant planet could explain the unique orbits of observable objects in the solar system. In The Search for Planet X, 1-4 players take on the role of astronomers, surveying the night sky and attempting to deduce the location of this hidden planet.