quarta-feira, 27 de abril de 2011

Corpos Celestes

Na astronomia, Corpo celeste é um termo que designa qualquer entidade física existente no espaço sideral. Podendo referir-se a um único objeto como a Lua, o Sol, ou um asteroide, como também a vários objetos que se mantêm unidos por forças gravitacionais, como galáxias, estrelas dupla, ou o sistema solar.

Os asteróides figuram como corpos celestes detentores de um tamanho reduzido, encontram-se na órbita do Sol, na maioria dos casos estão situados no cinturão de asteróides, próximo a Marte e Júpiter. No passado imaginava-se que os asteróides eram pequenos planetas.

Os cometas são considerados corpos celestes que possuem um tamanho pequeno, realizam deslocamento em torno do Sol, tal movimento é desenvolvido de forma irregular quanto ao seu contorno. Os cometas são formados basicamente por gelo e rochas

As estrelas são corpos celestes que possuem uma característica particular: são bastante reluzentes, tal luminosidade é proveniente do próprio astro. O conjunto de várias estrelas é chamado de constelação, assim, podemos destacar as zodiacais: Áries, Touro, Gêmeos, Câncer, Leão, Virgem, Libra, Escorpião, Sagitário, Capricórnio, Aquário e Peixes.

Os meteoróides são corpos celestes de pequeno porte que giram em torno do Sol. Esse astro, quando entra na atmosfera, é conhecido popularmente de ‘estrela cadente’. Quando ingressa na primeira camada da biosfera, o astro em questão sofre um grande desgaste e ao mesmo tempo se aquece, tornando-se reluzente. Quando o mesmo não se desintegra totalmente e atinge a superfície terrestre, o resíduo é chamado de meteorito.

Os planetas se distinguem dos outros corpos celestes em tamanho, massa, temperatura e outros aspectos, são astros desprovidos de luz própria que se encontram ao redor de uma estrela, o Sol. Juntamente com a Terra, existem outros planetas que se encontram na órbita do Sol, são eles: Mercúrio, Vênus, Marte, Júpiter, Saturno, Urano e Neturno (obs. Plutão deixou de ser considerado um planeta desde 24 de agosto de 2006).

Os satélites são pequenos corpos celestes que se encontram próximos a astros maiores, como a Lua, por exemplo.

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