who did this backlash come from?
He had conflict with the Church, as the majority of educated people subscribed to the Aristotelian geocentric view that the Earth is the center of the Universe
Galileo Galilei
t the time of Galileo's conflict with the Church, the majority of educated people subscribed to the Aristotelian geocentric view that the Earth is the center of the Universe and the orbit of all heavenly bodies, or Tycho Brahe's new system blending geocentrism with heliocentrism. 
what are the four biggest moons of jupiter Io, Europa, Ganymede, and Callisto. who were they first spotted by? Galileo Galilei when was he born? 15 February 1564 which scientific theory is he most well known for propounding? The Starry Messenger was there any backlash against his theories? Yes, against heliocentrism
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Galileo Galilei [SEP] Controversy over heliocentrism
At the time of Galileo's conflict with the Church, the majority of educated people subscribed to the Aristotelian geocentric view that the Earth is the center of the Universe and the orbit of all heavenly bodies, or Tycho Brahe's new system blending geocentrism with heliocentrism. Opposition to heliocentrism and Galileo's writings on it combined religious and scientific objections. Religious opposition to heliocentrism arose from biblical passages implying the fixed nature of the Earth. Scientific opposition came from Brahe, who argued that if heliocentrism were true, an annual stellar parallax should be observed, though none was at the time. Aristarchus and Copernicus had correctly postulated that parallax was negligible because the stars were so distant.