Joined in 2023 
82 
63 About this deal
The 4 sides of the board are marked with a symbol relating to one of the four seasons. Each player should now take a note sheet relating to the side closest to them. These sheets show the night sky from their relative perspective, making it easier for the players to orient themselves. a b Tom Standage (2000). The Neptune File: A Story of Astronomical Rivalry and the Pioneers of Planet Hunting. New York: Walker. p. 188. ISBN 978-0802713636. Millholland, Sarah; Laughlin, Gregory (2017). "Constraints on Planet Nine's Orbit and Sky Position within a Framework of Mean Motion Resonances". The Astronomical Journal. 153 (3): 91. arXiv: 1612.07774. Bibcode: 2017AJ....153...91M. doi: 10.3847/1538-3881/153/3/91. S2CID 119325788. 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.
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. Some may therefore feel that after finding Planet X once or twice, they don’t need to keep looking. For players with a penchant for puzzle-solving, though, it’ll be a delight to immediately misplace it and begin searching again. In 2012, Rodney Gomes modelled the orbits of 92 Kuiper belt objects and found that six of those orbits were far more elongated than the model predicted. He concluded that the simplest explanation was the gravitational pull of a distant planetary companion, such as a Neptune-sized object at 1,500 AU. This Neptune-sized object would cause the perihelia of objects with semi-major axes greater than 300 AU to oscillate, delivering them into planet-crossing orbits like those of (308933) 2006 SQ 372 and (87269) 2000 OO 67 or detached orbits like Sedna's. [69] Planet Nine [ edit ] Prediction of hypothetical Planet Nine's orbit based on unique clustering Marc W. Buie; William M. Grundy & Eliot F. Young (July 2006). "Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2". Astronomical Journal. 132 (1): 290–298. arXiv: astro-ph/0512491. Bibcode: 2006AJ....132..290B. doi: 10.1086/504422. S2CID 119386667. You also receive one bonus point for each sector in which you were the first person to submit a correct theory. If more than one player submitted correct theories at the same time, you both receive a point. The Final
The theory proposes that the objects in the Oort cloud may have been captured with the help of a binary companion to our Sun. "Binary systems are far more efficient at capturing objects than are single stars," said Loeb. "If the Oort cloud formed as observed, it would imply that the Sun did in fact have a companion of similar mass that was lost before the Sun left its birth cluster." In the 1840s, the French mathematician Urbain Le Verrier used Newtonian mechanics to analyse perturbations in the orbit of Uranus, and hypothesised that they were caused by the gravitational pull of a yet-undiscovered planet. Le Verrier predicted the position of this new planet and sent his calculations to German astronomer Johann Gottfried Galle. On 23 September 1846, the night following his receipt of the letter, Galle and his student Heinrich d'Arrest discovered Neptune, exactly where Le Verrier had predicted. [10] There remained some slight discrepancies in the giant planets' orbits. These were taken to indicate the existence of yet another planet orbiting beyond Neptune. Brown, M.E.; Trujillo, C. & Rabinowitz, D. (2004). "Discovery of a candidate inner Oort Cloud planetoid". Astrophysical Journal. 617 (1): 645–649. arXiv: astro-ph/0404456. Bibcode: 2004ApJ...617..645B. doi: 10.1086/422095. S2CID 7738201. There’s also some pleasing player interaction in the game as every action you take is publicly announced, with only the app’s answers kept secret. Combined with the opportunity for players to make claims on the non-Planet X objects they think they’ve found – sharing knowledge with other players for VP – this can lead to interesting second-level deductions, guesswork, and bluffing. However, it’s a subtle, optional form of interaction, meaning the game doesn’t feel all that different whether you play with three others or the challenging-but-fair AI opponent inbuilt in the app.
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.
While the astronomical community widely agrees that PlanetX, as originally envisioned, does not exist, the concept of an as-yet-unobserved planet has been revived by a number of astronomers to explain other anomalies observed in the outer Solar System. [5] As of March 2014, observations with the WISE telescope have ruled out the possibility of a Saturn-sized object (95 Earth masses) out to 10,000 AU, and a Jupiter-sized (≈318 Earth masses) or larger object out to 26,000 AU. [6]
Great Deal 
New Comment