The declaration was a laundry list of affronts to the colonies by King George III, wherein Jefferson et.al. argued that since the monarchy did not treat the colonists like other Britons, the colonists had the right to form their own sovereign nation. It was also intended to justify this action to other monarchies to prevent them from helping Britain retain the colonies under the doctrine of Intervention. So it helped to justify the war domestically and internationally.
Explanation:
Asimov's thesis is that the beauty of science is the same as the beauty of nature. He expands on this theory with a grandeur explanation of the vast happenings in nature and the universe, such as the speed of light and sound, and the truth that the stars are really amazingly large suns like our own.