Although ideas about astronomy have existed since at least ancient Greece, we have so far only had a near-accurate definition of what a planet is. As recently as 2006, Pluto, once considered the ninth planet, was stripped of its status and downgraded to a dwarf planet. But is it necessary to make such a decision? Since the decision was announced, we have continued to answer this particular question – whether Pluto is still a planet.
Are you a bigot to the facts? Are you still curious? So why not subscribe to more clips like mine and learn more about the fascinating content? In 1930, astronomical ancestors observed it and named it Pluto. At the time of Pluto's discovery, after the classical rulers of the lower classes, scientists called it the ninth planet in the solar system, and at that time it was unanimously believed that Pluto was a planet in line with Earth, Mars, jupiter, and even never questioned, and this title was maintained for 75 years.
It wasn't until 1992, when astronomers discovered that there were other massive objects about the size of Pluto in the distant Kuiper Belt, which were generally not enough to reclassify Pluto's rank, but in 2005, the scientific and observed states of Neptune and Pluto were rapidly sealed. Neptune is one of the overseas objects discovered this time in the scattered disk region of the solar system, and although Pluto is larger and makes it look slightly larger, in fact, most importantly, Niesse is 27% more massive than Pluto. In the initial negotiations, Erius itself could be the tenth planet of the International Astronomical Association, and regardless of the complexity of its gas, Pluto's ranking as a planet ultimately depended on the definition of a planet.
Since 2006, when the International Astronomical Union created a formal definition of "planet", the debate has also reached its peak, leading to the downgrade of Pluto. This has always been a controversial topic. Not everyone agrees with the Decision of the International Astronomical Union, because the United Astronomical Association is set to meet three primary conditions: sufficient attraction and its own gravity to make it a sphere, and third, it must have a qualitative advantage and the ability to clean up nearby small objects and cosmic debris. What effect does this have on Pluto? Because it is in the Kuiper Belt, it is surrounded by many objects that it cannot remove from the ice.
The same is true of other potential candidate planets, such as Eros and Saris, which are large planets among asteroids in the asteroid belt. There are various international views opposing the International Astronomical Union's reclassification of Pluto, the simplest of which is that Pluto is still a large object, the ninth largest planet in the solar system, the tenth most massive object, and the largest extra-Neptune object in size.
Pluto was discovered in 1930 and is named after the god who ruled the underworld when Pluto was discovered. Scientists call it the ninth planet in the solar system.
Pluto has five moons, one of which is about half the size of Pluto itself, and in terms of distance it is farther from the Sun than other planets, but at certain points in its unusual orbit, Pluto is actually closer than Planet VIII, and on Pluto's 248-year cycle, there are about 20 years closer to us than Neptune, however, the International Astronomical Union's definition of the planet and its subsequent treatment of Pluto have aroused fierce criticism from astronomers because of the rules laid down in 2006, Very few celestial bodies can be judged as a planet.
The first criterion for a planet is that a planet must orbit a star, but the criterion seems to ignore wandering planets that form outside the star system, which are only valid inside the solar system and cannot be applied to the more general universe. For people like planetary scientist Alan Stern, the main problem is that Pluto failed to pass the third criterion, because even in the solar system, no star can completely clear debris from its region. The current definition is more skewed towards a star closer to the Sun, because whether or not the amount of debris increases, an increase in distance from the Sun means that a larger star is needed to clear debris in orbit, for example, if Earth is in the position of Neptune, it cannot be identified as a planet.
There seems to be a tendency within the realm that the definition I use is more about limiting the number of planets than for identifying stars with planetary properties, which completely changes the way we classify objects in the sky. The main reason for Pluto's downgrade was a misjudgment in the discovery of Eris, who was originally discovered to be larger than the ninth planet and larger in mass and volume, which prompted scientists to reclassify it in their initial observations, however, we now know that Pluto is actually larger than Eris.
While the odds are slim to chance, if scientists had known this from the outset, the question of Pluto's eligibility might never have been raised, and conversely, we might now be arguing about the introduction of the tenth moon, Eris, and possibly even eleven moons, Sarah, and the number of planets in the solar system might now only increase. It turns out that not all astronomers disagree with the International Astronomical Union's ruling, and for many opponents, they prefer to think of Pluto as a large star.
Pluto is still small even compared to the smallest planet, as Mercury is twice as large as it is. In fact, Pluto is not as large as the Moon of the Earth-Moon system. It is mostly made up of ice rather than rocks like Mercury, Venus, Earth, and Mars, and for those who do not object to Pluto's downgrading to a dwarf planet, it has a more elliptical orbit than a traditional planet. It can be said that Pluto was originally classified as a planet because it was first discovered because we knew only so little about it, and we didn't know about the existence of the Kuiper Belt so we didn't consider this object as part of a larger system.
In ancient Greece, when the word "planet" was proposed, they did not count the earth in it because they believed that the earth was the center of all things. Back then, they also gave the sun and moon the status of planets. Obviously, the way we classify the solar system has changed. According to the International Astronomical Union, Pluto may no longer be a planet, which is not necessarily a bad thing for it, and it has a rarer title — dwarf planet, which it enjoys only with the other four celestial bodies in the solar system, according to Neil Degras Tyson, the other two Kuiper Belt objects of Birus (Haumea and Orion).
In any case, as far as space is concerned, the term planet goes far beyond its purpose, and it is more practical to call celestial bodies precise names, such as terrestrial planets, giant gas planets, asteroids, and Kuiper Belt objects. Because these titles cover more important details, Pluto is no longer officially classified as a planet, and although the debate is still raging, it doesn't matter anymore, Pluto will always be one of the original nine planets. Some people are still opposed to its downgrade, but some agree with the classification of dwarf planets, and as we delve deeper and understand our exact position in the universe, we can see the terminology for describing the solar system constantly updated in the future, which is why Pluto is still considered a planet.
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Glossary:
The demotion of the Elliptical ellipse degrades the dwarf dwarf planet Kuiper belt (KBO) kuiper belt
IAU (International Astronomical Union) International Astronomical Union
Eris is now known to be the second largest dwarf planet in the solar system, 127% of Pluto's mass, belonging to the outer Neptune object (TNO), a discrete disk object (SDO) with a high eccentricity, and a larger moon, Dysnomia.
Haumea Haumea is the third brightest object in the Kuiper Belt after Pluto and Orion.
Makemake Isuzu is about three-quarters the diameter of Pluto
by: Year of the Fog, 1111, Mingli