Many people did not believed in the discoveries made by Galileo especially the concept of heliocentrism because of a conflict between Catholic church and Galileo.
There were many controversies between the idea of Heliocentrism that Catholic churches have threatened Galileo to abolish it.
There was many other astronomers as well who did not believed in his theory because of absence of stellar parallax and considered this theory as foolish and absurd.
Dan Brown in his novels has very well explained the difference in ideas of Galileo and Catholic church.
