Question

42With respect to Wilhelm Friedrich Bessel and his work, which of the following is most supported bythe information in the article?A Bessel's belief in the existence of Sirius's companion was based on calculations and reasoning rather than on the direct observation of that companion.B One of Bessel's great achievements was to observe a complete orbit of Sirius's companion.C When Bessel began his research, he was convinced that both Sirius and Procyon were following an irregular, unpredictable trajectory.D After compiling his Sirius and Procyon research data for many years, Bessel published his conclusions in the second half of the 19r century.E Bessel found it very hard to convince other astronomers of the importance of his discoveries.

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. Dessa forma, ele concluiu que existia uma companhia invisível em torno da estrela Sirius, utilizando raciocínio e cálculos para comprovar tal descoberta. Portanto, a alternativa correta é a letra A.