What is the relationship between artificial satellites and astronomy? a. Astronomers are dependent upon satellite technology.
b. Satellites are only used by astronomy faculty for research.
c. Satellites are one type of technology used by astronomers for research.
d. Satellites are only used by astronomy employees of government agencies.

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.