After 1978, a number of astronomers kept up the search for Lowell's Planet X, convinced that, because Pluto was no longer a viable candidate, an unseen tenth planet must have been perturbing the outer planets.[42] In the 1980s and 1990s, Robert Harrington led a search to determine the real cause of the apparent irregularities.[42] He calculated that any Planet X would be at roughly three times the distance of Neptune from the Sun; its orbit would be highly eccentric, and strongly inclined to the ecliptic—the planet's orbit would be at roughly a 32-degree angle from the orbital plane of the other known planets.[43] This hypothesis was met with a mixed reception.
Jäsenvaltion, jonka lainkäyttövaltaan kuuluvalla alueella tonnikalan lihotus- tai kasvatuslaitos sijaitsee, on toimitettava viikon kuluessa altaaseenpanon päättymisestä tarkkailijan vahvistama altaaseenpanoraportti sille jäsenvaltiolle tai sopimuspuolelle, jonka lipun alla purjehtivat alukset ovat tonnikalat kalastaneet, ja komissiolleParaCrawl Corpus ParaCrawl Corpus