Comets (2) – Comets only appear in certain sectors (noted on your sheet). When surveying for them, you must start and end in one of these designated sectors. a b "IAU 2006 General Assembly: Resolutions 5 and 6" (PDF). International Astronomical Union. 2006-08-24.

In 2020, a new theory was published in The Astrophysical Journal Lettersby scientists from Harvard University which suggested that not only might Planet 9 actually exist but that there may once have been a binary companion to our Sun . C. de la Fuente Marcos & R. de la Fuente Marcos (1 January 2024). "Past the outer rim, into the unknown: structures beyond the Kuiper Cliff". Monthly Notices of the Royal Astronomical Society Letters. 527 (1): L110–L114. arXiv: 2309.03885. Bibcode: 2024MNRAS.527L.110D. doi: 10.1093/mnrasl/slad132 . Retrieved 28 September 2023.Starting in 2018, several surveys have discovered multiple objects located beyond the Kuiper Cliff. Some of these new discoveries are close to the heliopause (120 AU) or well beyond it ( 2018 VG 18, 2018 AG 37, 2020 BE 102, 2020 MK 53). An analysis of the TNO data available prior to September 2023 shows that there is a gap at about 72 AU, far from any mean-motion resonances with Neptune. [88] Such a gap may have been induced by a massive perturber located further away. Even without gravitational evidence, Mike Brown, the discoverer of Sedna, has argued that Sedna's 12,000-year orbit means that probability alone suggests that an Earth-sized object exists beyond Neptune. Sedna's orbit is so eccentric that it spends only a small fraction of its orbital period near the Sun, where it can be easily observed. This means that unless its discovery was a freak accident, there is probably a substantial population of objects roughly Sedna's diameter yet to be observed in its orbital region. [77] Mike Brown noted that As of 2023 the following observations severely constrain the mass and distance of any possible additional Solar System planet:

The team concluded that the observed objects only seem to be clustered because of selection bias. However, others disagree, claiming more data is needed. And this may soon be coming. New planet found in our Solar System?". National Geographic. 2012. Archived from the original on May 14, 2012 . Retrieved 2012-05-21. NASA's Solar System Exploration: Multimedia: Gallery: Pluto's Symbol". NASA. Archived from the original on 2006-10-01 . Retrieved 2007-03-25.Luhman's study found 762 new objects among the data, but no signs of a Saturn-sized object out to 10,000 times the Earth-sun distance (an astronomical unit, or AU; 1 AU is about 93 million miles, or 150 million kilometers). Nor did Luhman spot any Jupiter-size or larger objects out to 26,000 AUs.

Gerald D. Quinlan (May 6, 1993). "Planet X: A Myth Exposed". Nature. 363 (6424): 18–19. Bibcode: 1993Natur.363...18Q. doi: 10.1038/363018b0. S2CID 29058579. Enter The Search for Planet X, which fills a very specific gap that also speaks directly to my own interests: It’s a deduction game, with a logic puzzle at its heart, and is competitive (rather than cooperative) with multiple ways to score, so that you can still stay in the game even if you aren’t the first to solve the ultimate mystery. It’s brilliant, one of my favorite games of 2020, and has me feeling nostalgic for the days of GAMES magazine and other logic puzzles (hell, even that one section on the LSATs, which I thought was hilarious because so many people do those puzzles for fun) while also making gameplay easier with a companion app. Venkatesh Ketakar" redirects here. For the sociologist, see Shridhar Venkatesh Ketkar. Percival Lowell, originator of the Planet X hypothesis Central Bureau for Astronomical Telegrams, International Astronomical Union (2006). "Circular No. 8747" (PDF). Archived from the original on February 5, 2007 . Retrieved 2011-07-05. Even before Neptune's discovery, some speculated that one planet alone was not enough to explain the discrepancy. On 17 November 1834, the British amateur astronomer the Reverend Thomas John Hussey reported a conversation he had had with French astronomer Alexis Bouvard to George Biddell Airy, the British Astronomer Royal. Hussey reported that when he suggested to Bouvard that the unusual motion of Uranus might be due to the gravitational influence of an undiscovered planet, Bouvard replied that the idea had occurred to him, and that he had corresponded with Peter Andreas Hansen, director of the Seeberg Observatory in Gotha, about the subject. Hansen's opinion was that a single body could not adequately explain the motion of Uranus, and postulated that two planets lay beyond Uranus. [11]

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And that’s how to play The Search For Planet X! This is a lovely little deduction game, with gorgeous production and brilliant app integration. It’s not for everyone, particularly as there’s very little interaction an The existence of Planet 9 was dealt a blow last year, when a team led by physicist Kevin Napier, at the University of Michigan in Ann Arbor, conducted a meta-analysis of surveys examining the orbits of ‘extreme’ trans-Neptunian objects. The researchers found that the objects’ perturbed orbits could actually be explained without the presence of a nearby planet. 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. Using these rules, you will gradually be able to work out the pattern of the night sky and where each object is. Players take it in turns to complete actions to uncover more clues to solve the puzzle. There are four actions you can take each time: