Brussels vs Aurora

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The City of Brussels (French: Ville de Bruxelles [vil də bʁysɛl] or alternatively Bruxelles-Ville [bʁysɛl vil]; Dutch: Stad Brussel [stɑd ˈbrʏsəl] or Brussel-Stad) is the largest municipality and historic centre of the Brussels-Capital Region, and the capital of Belgium. Besides the strict centre, in addition, it covers the immediate northern outskirts where it borders municipalities in Flanders. It is the administrative center of the European Union, thus often dubbed, along with the area, the EU's capital city. The City of Brussels is a municipality composed of the central historic city and certain additional regions within the greater Brussels-Capital Region, namely Haren, Laeken and Neder-Over-Heembeek to the north, as well as Avenue Louise/Louizalaan and the Bois de la Cambre/Ter Kamerenbos park to the south.

As of 1 January 2017, the City of Brussels had a whole population of 176,545. The entire area is 32.61 km2 (12.59 sq mi) which gives a population density of 5,475 inhabitants per square kilometre (14,180/sq mi). As of 2007, there were approximately 50,000 registered non-Belgians in the City of Brussels. In common with all of Brussels' municipalities, it's legally bilingual (French--Dutch).

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