Brus vs Aurora

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Brus (Serbian Cyrillic: Брус, pronounced [brûːs]) is a town and municipality located in the Rasina District of central Serbia. According to the 2011 census, the population of the town is 4,572, while the population of the municipality is 16,293. It is located at 430 metres (1,410 ft) above sea level, just below the Kopaonik ski resort.

The city is surrounded by hills on three levels, where the lowest one is a place where the Grasevka river firths into the Rasina river. On the upper level of the town a fountain of medicinal mineral water is located.

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