A grande e bela galáxia espiral M101 é uma das últimas entradas do famoso catálogo de Charles Messier, mas definitivamente não é uma das menos importantes. Com cerca de 170.000 anos-luz de extensão, esta galáxia é enorme, quase duas vezes o tamanho da nossa galáxia, a Via Láctea. M101 foi também uma das nebulosas espirais originais observadas pelo grande telescópio do século XIX de Lord Rosse, o Leviatã de Parsontown. O M101 compartilha este campo de visão telescópico moderno com galáxias de fundo mais distantes, estrelas em primeiro plano na Via Láctea e uma galáxia anã companheira NGC 5474 (canto inferior direito). As cores das estrelas da Via Láctea também podem ser encontradas à luz das estrelas do grande universo insular. Seu núcleo é dominado pela luz de estrelas amarelas e frias. Ao longo de seus grandes braços espirais de design estão as cores azuis de estrelas jovens e quentes misturadas com pistas de poeira obscuras e regiões de formação de estrelas rosadas. Também conhecida como a Galáxia do Pinwheel, a M101 está dentro dos limites da constelação do norte da Ursa Maior, a cerca de 23 milhões de anos-luz de distância. Seu companheiro NGC 5474 provavelmente foi distorcido por suas interações gravitacionais passadas com o dominante M101.
Texto: Júlia Machado
Crédito de imagem e direitos autorais: Christoph Kaltseis, CEDIC 2019
NASA
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