January 2020 1 16 Report
Noticia divulgada em 5 de maio de 2011.
O cometa Halley, que passou pela Terra em 1986, só poderá ser visto novamente em sua totalidade daqui a 51 anos.

Considerando a data da ultima apariçao e o ano da divulgação dessa noticia, determine o periodo aproximado da orbita do cometa Halley.
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