For example, Uranus was discovered in 1781. This was right in the middle of the American War of Independence, and not long before the 1789 French Revolution.
Neptune was discovered in 1846, which was the year when general anaesthesia was used in surgery for the first time. Also, the Communist Manifesto was published in 1848.
The discovery of Pluto in 1930 is usually associated with an active development in nuclear physics and powerful totalitarian regimes that were established then in Europe and Russia.
In the end of the 20th – beginning of the 21st century astronomers discovered that Pluto is actually one of a multitude of similar objects forming so-called Kuiper belt beyond the orbit of Neptune. In 2006, Pluto officially lost its status of a proper planet and became…