Qual é o tamanho do maior homem do mundo? Segundo o Guinness, livro dos recordes, ele tem 2,46m, se chama Sultan Kösen e vive na Turquia. Do lado dele, fico parecendo baixinho, apesar de ele não chegar a medir duas vezes mais que eu. Sua altura é mais do que três vezes a do menor homem do mundo, o chinês He Pingping, com 74cm de altura!
Apesar de ficarmos impressionados com estas disparidades, se formos compará-las com o que temos no Universo, todos nós pareceríamos ter a mesmíssima altura.
Vou usar as estrelas para termos uma melhor ideia do que eu estou falando. Nosso Sol possui um diâmetro de aproximadamente 1,5 milhão de quilômetros; caberiam dentro dele quase 1,4 milhão de planetas do tamanho da Terra, comigo, o chinês, o turco e tudo o mais. O Sol, assim mesmo, é considerado uma estrela anã! Ou seja, existem estrelas muito maiores que o Sol! E menores também.
As menores são as consideradas estrelas fracassadas, chamadas de anãs marrons. São estrelas que não conseguiram iniciar a fusão do hidrogênio. Uma das menores é a OTS 44, da constelação do Camaleão, com apenas dois décimos do diâmetro do Sol.
Já as maiores são as hipergigantes vermelhas, estrelas com mais de 100 vezes a massa do Sol e com uma luminosidade superior a 1 milhão de vezes. A maior já conhecida é a VY Canis Majoris, com um diâmetro de 1.800 a 2.100 vezes maior que o do Sol. Para se ter uma ideia, essa estrela é do tamanho da órbita de Saturno ao redor do Sol! Caberiam dentro desta estrela o Sol e os planetas até Saturno. A distância aproximada do Sol até Saturno é de 9 UA (Unidades Astronômicas) ou 1,4 bilhão de quilômetros!
O engraçado é que estamos mais suscetíveis a ficarmos mais impressionados com o maior e o menor homens do mundo do que a estrela que mencionei acima, pelo simples fato de que não dá para, nem mesmo imaginar, uma estrela com aquele tamanho todo!
Um abraço e até a próxima.
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