Before the twentieth century,astronomers lacked knowledge of something,and this caused them to think that the Sun was at the centre of our star system.What was that something?
A)globular clusters
B)Cepheid variable stars
C)the dimming effects of gas and dust
D)galactic rotation

Question

Quizplus · Accepted Answer

Astronomers lacked knowledge of the dimming effects of gas and dust, which caused them to believe that the Sun was at the center of our star system. This was due to the fact that gas and dust absorb and scatter light, making distant stars appear dimmer and redder than they actually are. This effect, known as interstellar extinction, made it difficult for astronomers to accurately measure the distances to stars and to determine their true positions in the galaxy.

Before the Twentieth Century,astronomers Lacked Knowledge of Something,and This Caused