Braga vs Aurora

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Braga ( BRAH-gə, Portuguese: [ˈbɾaɣɐ] (listen); Proto-Celtic: *Bracara) is a city and a municipality in the northwestern Portuguese district of Braga, in the historical and cultural Minho Province. The city has a resident population of 192,494 inhabitants (in 2011), representing the seventh largest municipality in Portugal (by population). Its area is 183.40 km2. Its agglomerated urban area extends from the Cávado River to the Este River. It is the third-largest urban centre in Portugal (after Lisbon and Porto). It is host to the oldest Portuguese archdiocese, the Archdiocese of Braga of the Catholic Church and it is the seat of the Primacy of the Spains.

Under the Roman Empire, then known as Bracara Augusta, the settlement was the capital of the province of Gallaecia. Inside of the city there is also a castle tower that can be visited. Nowadays, Braga is a major hub for inland Northern Portugal and it is an important stop on the Portuguese Way path of the Road of St James. The city was also the European Youth Capital in 2012.

Source: Wikipedia

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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