segunda-feira, 26 de abril de 2010

Principais Astros do Sistema Solar

O nosso sistema solar consiste em uma estrela média chamada Sol. É formado por oito planetas: Mercúrio, Vênus, Terra, Marte, Júpiter, Saturno, Urano e Netuno. Até agosto de 2006, Plutão era considerado um planeta, porem, a  União Astronômica Internacional mudou os critérios para a definição de um planeta. Como Plutão é pequeno em relação aos outros, passou a ser considerado um planeta anão ou planetóide. incluindo os satélites dos planetas; numerosos cometas, asteróides, e meteoróides; e o espaço interplanetário. O Sol é a fonte mais rica de energia eletromagnética (principalmente sob a forma de calor e luz) do sistema solar. Muitos destes planetas podemos visualizar a noite a olho nu ou com a ajuda de um telescópio. Os planetas, ao contrário das estrelas, não possuem luz própria e só podem ser vistos graças à luz que refletem do Sol. Ao redor dos planetas, gravitam 67 satélites, dentre eles a Lua (satélite natural do nosso planeta), que gravita ao redor no planeta Terra.
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6 comentários:

  1. oi mas quais são os principais atros do sistema solar?

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  2. PERRUNTEI O PRICIPAU ASTRO O SISTEMA SOLAR

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