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Ciência Viva - Agência Nacional para a Cultura Científica e Tecnológica
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Observação do Cometa Hale-Bopp
Observação do Cometa Hale-Bopp

Astronomia no Verão 1998
Astronomia no Verão 1998

Astronomia no Verão 1997
Astronomia no Verão 1997