Aurora vs Rennes

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An aurora (plural: auroras or aurorae), sometimes referred to as polar lights (aurora polaris), northern lights (aurora borealis), or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras are the result of disturbances in the magnetosphere caused by solar wind. These disturbances are sometimes strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere).

The resulting ionization and excitation of atmospheric constituents emit light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.

Source: Wikipedia

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Rennes (French pronunciation: [ʁɛn] (listen); Breton: Roazhon [ˈrwɑːzən]; Gallo: Resnn; Latin: Condate Redonum) is a city in the east of Brittany in northwestern France at the confluence of the Ille and the Vilaine. Rennes is the capital of the region of Brittany, as well as the Ille-et-Vilaine department. In 2015, the city was the tenth largest in France, with a metropolitan area of about 720,000 inhabitants. The inhabitants of Rennes are called Rennais(e)(es) in French Rennes's history goes back more than 2,000 years, at a time when it was a small Gallic village named Condate. Together with Vannes and Nantes, it was one of the major cities of the ancient Duchy of Brittany. From the early sixteenth century until the French Revolution, Rennes was a parliamentary, administrative and garrison city of the historic province of Brittany of the Kingdom of France as evidenced by its 17th century Parliament's Palace. Rennes played an important role in the Stamped Paper Revolt in 1675. After the destructive fire of 1720, the medieval wooden center of the city was partially rebuilt in stone.

Remaining mostly rural until the Second World War, Rennes really developed in the twentieth century. Since the 1950s, Rennes has grown in importance through rural flight and its modern industrial development, partly automotive. The city developed extensive building plans to accommodate upwards of 200,000 inhabitants. During the 1980s, Rennes became one of the main centres in telecommunication and high technology industry. It is now a significant digital innovation centre in France. In 2002, Rennes became the smallest city in the world to have a Metro line. Labeled a city of art and history, it has preserved an important medieval and classical heritage within its historic center with over 90 buildings protected as historic monuments. With more than 66,000 students in 2016, it is also the eighth-largest university campus of France. . In 2018, L'Express named Rennes as "the most liveable city in France".

Source: Wikipedia