Question

45With respect to Sirius B, which of the following is not supported by information in the article?A Sirius B accompanies the brightest star visible from earth.B Sirius B is the only celestial body known to affect the trajectory of a star.C The century in which Sirius B was discovered was not the century in which it was truly understood.D Belief in Sirius B's existence was at first based on scientific conjecture rather than on concrete proof.E The discovery of Sirius B suggested that the stellar universe was more complex and unpredictable than previously thought.

Answer 1

Conforme o texto, Friedrich Wilhelm Bessel foi o primeiro astrônomo a descobrir que a estrela Sirius estava sendo circundada por outra estrela, a Sirius B. Essa descoberta ocorreu em 1844, quando o astrônomo percebeu que a trajetória da estrela Sirius estava indo para cima e para baixo, junto com a estrela Procyon. Dessa forma, ele concluiu que existia uma companhia invisível em torno da estrela Sirius. Portanto, a alternativa correta é a letra B, pois a estrela Sirius B não era o único corpo a mudar a interferir na trajetória da estrela Sirius.