Glossary term: Atmosfera
Description: A atmosfera é uma camada de gás que envolve um corpo celeste. Ela é mantida por causa da atração gravitacional do corpo celeste e, portanto, é mais densa na superfície e se funde com o espaço interplanetário em grandes altitudes.
Para planetas com superfícies sólidas ou líquidas, o limite inferior da atmosfera é definido. As estrelas têm interiores gasosos e, portanto, não têm um limite inferior claro para suas atmosferas. Uma atmosfera estelar normalmente se refere à camada gasosa externa de uma estrela através da qual a luz do interior viaja para o espaço.
O campo magnético de um planeta pode proteger sua atmosfera de se dissipar rapidamente no espaço devido ao vento solar ou estelar. No caso da Terra, ele também protege todos os organismos contra danos genéticos devido aos efeitos nocivos do vento solar e dos raios cósmicos.
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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