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Um Dilema Chamado Plutão: Planeta ou Planeta Anão? - Space Today TV Ep.1454

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Em 2006, a União Astronômica Internacional, em votação, decidiu rever o significado de planeta.

Isso aconteceu, muito devido às descobertas de um grande número de objetos no Cinturão de Kuiper, do qual Plutão é como se fosse sua porta de entrada.

Além do fato de ser esférico e orbitar o Sol, o planeta deve ter a sua órbita limpa, ou seja, não deve compartilhar a sua órbita com outros objetos que rivalizam em tamanho com ele.

Com base nisso, Plutão, foi reclassificado como Planeta Anão, e desde então teve início uma grande discussão sobre isso.

DISCLAIMER: Plutão não está nem aí como ele é chamado, isso é apenas uma convenção, se tudo for planeta, imagina quantos milhares de nomes de planetas nossos filhos e netos terão que decorar, por outro lado, como eu falo, se um anão é uma pessoa, um planeta anão é um planeta.

Como essa pequena treta astronômica ainda rende muito, um pesquisador chamado Philip Metzger do Florida space Insitute, resolveu apimentar mais a discussão e publicou um artigo na revista Icarus, sobre a classificação de Plutão.

O artigo dele é baseado numa busca bibliográfica que ele fez onde somente em em um artigo em 1802 é mencionado o fato da órbita ter que ser limpa para ser um planeta.

Além disso ele conta que a divisão, por exemplo, entre planeta e asteroide, veio na década de 1950, quando Gerard Kuiper fez a distinção entre os dois objetos com base na formação.

Metzger diz então que a classificação da UAI é errada pois na literatura o fato de ter a órbita limpa não é considerado como um padrão para definir se um objeto é um planeta ou asteroide.

Ele defende que a classificação deveria ser feita com base em propriedades intrínsecas do objeto e não apenas na dinâmica de sua órbita.

Em defesa dessa tese, Plutão é um mundo muito complexo, ele possui provavelmente um ocenao em subsuperfície, possui uma atmosfera complexa dividida em múltiplas camadas, possui compostos orgânicos, antigos lagos e múltiplos satélites.

Por exemplo, Plutão é mundo muito mais dinâmico do que Marte por exemplo.

Talvez, nem os cientistas esperassem que Plutão seria um mundo tão complexo assim, até 2015 quando a New horizons passou por lá, talvez a maioria dos cientistas esperassem encontrar um undo sem graça, e todos os dados da New horizons surpreenderam e muito os pesquisadores, e talvez, a partir de 2015 essa discussão se tornou ainda mais calorosa.

Bem, não temos muito o que discutir já que a decisão foi tomada pela UAI, mas na minha singela opinião de geofísico, eu acho que deveríamos olhar para outras propriedades, e acho que a New horizons nos apresentou um mundo totalmente novo, um objeto praticamente ativo geologicamente falando, com uma atmosfera complexa e por esse motivo poderiam rever a classificação de planetas incluindo outros requisitos e não somente as propriedades orbitais.

#Plutão

Fonte:



Artigo:



Artigo do Herschel:



Artigo do Kuiper:

कैसे करें 12th Class के बाद IAS की तैयारी (Without coaching) 8 EASY STEP

this video will be helpful for those students who are thinking to prepare for upsc after 12th class.
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Londolozi Specialist Wildlife Photographic Safaris

A detailed summary of what a Specialist photographic Safari at Londolozi Game reserve is about

Pocophone F1 Teardown - I found LIQUID inside!

Lets Teardown the Pocophone F1. Quite possibly the most popular budget phone of this year. Lets see if that internal liquid cooling has any actual liquid inside of it. Opening up the Pocophone F1 is actually pretty simple. It is super similar to the older iPhone design. With two screws holding together the pocophone, and then the back housing being removed.

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20 Magic Tricks That You Can Do

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Hero Buffalo Brave Saves Baby Elephant From Lion Attack, Lion Vs Buffalo | Lion Hunting Fail

#NAP , #NAPanimal
Hero Buffalo Brave Saves Baby Elephant From Lion Attack, Lion Vs Buffalo | Lion Hunting Fail
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How to make: Superior Armor Piercing Pellets 2

The continuing video were I test accuracy, various ballistic tests, and show a new way to make these custom AP pellets.

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EL SECRETO MORTAL DE LOS TEMPLARIOS

¿Quienes eran Los Templarios?
¿Ocultaron el Santo Grial?
¿Donde puede estar y qué podria ser el Santo Grial?

Three Little Kittens | +More Nursery Rhymes & Kids Songs - Cocomelon (ABCkidTV)

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Amazing Flash Flood / Debris Flow Southern Utah HD

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July 18th 2013. Massive debris flow / flash flood in Southern Utah. Close to 3 of rain fell north of my location and I filmed these shots 6+ hours after the fact.

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Baby Shark | +More Nursery Rhymes & Kids Songs - Cocomelon (ABCkidTV)

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Scientists Discovered A Skin-Crawling Secret That This Strange Island Had Concealed For 80 Years

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To the unassuming traveler, the Lord Howe Island Group probably looks like a tropical paradise. And while it’s true that the lush forests, beaches and coral reef are something of a haven, there’s more to these Australian islands than first meets the eye. Indeed, one particular isle has been harboring a decades-old, skin-crawling secret that was left undiscovered for over 80 years.




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Economics : पंचवर्षीय योजना | Indian Economy Lecture for SSC , UPSC , IAS , UPPCS ,Railway

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As the Athletic Director and head coach of the Varsity Soccer team at Ryerson University, Dr. Joseph is often asked what skills he is searching for as a recruiter: is it speed? Strength? Agility? In Dr. Joseph's TEDx Talk, he explores self confidence and how it is not just the most important skill in athletics, but in our lives.

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10 Alimentos alcalinos; que pueden salvar tu vida

Los alimentos alcalinos poseen grandes beneficios saludables, ya que, la mayor parte de los alimentos que comemos hoy en día, se encuentran literalmente, llenos de tóxicos quimicos que acidifican el organismo y las enfermedades, necesitan de un medio acido para desarrollarse. Por ello la incorporación de alimentos naturales alcalinos en nuestra dieta diaria, es esencial, para combatir la acidez organica.

[9.4] New Sealed Indictment Count / Prisons Being Prepped / Trust Sessions


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Burmese pythons have an established permanent breeding population in South Florida and belong to the new apex predators of the Everglades today. Top predators like the american crocodiles and american alligators prey regularly on all kinds of reptiles, including pythons. An adult alligator will have little trouble to overpower, kill and eat any juvenile and in some cases even an adult constrictor. Nevertheless, a fully grown Burmese Python can reach over twenty feet in lengths and becomes extremely dangerous prey item for most crocodilians including the American Alligator. These large constrictors have not much to fear and will feed on most animals they come across (including alligators) when hungry. Python vs Alligator was filmed by Heiko Kiera aka Ojatro near the Everglades in 2009.

States of India Easy way to Learn

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