Before satellite technology was developed, information took longer to reach the general public.
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Since the dawn of the space age in the 1960s, we have sent spacecraft to the most easily reached places in our solar system, such as Mars. 
The Hubble gives us images that are thousands of years old because light travels at a finite speed across vast distances of space.
Special talents and training are required to become a rocket scientist.
It is likely that some day it will be possible for humans to colonize and sustain life on other planets, especially our neighbor Mars.
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