Liberec vs Aurora

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Liberec (Czech: [ˈlɪbɛrɛts] (listen); German: Reichenberg [ˈʁaɪçn̩bɛɐ̯k]) is a city in the Czech Republic. It is on the Lusatian Neisse and surrounded by the Jizera Mountains and Ještěd-Kozákov Ridge. It is the fifth-largest city in the Czech Republic. Liberec was once home to a thriving textile industry and hence nicknamed the "Manchester of Bohemia". For many Czechs, Liberec is mostly associated with the city's dominant Ještěd Tower.

Since the end of the 19th century, the city has been a conurbation with the suburb of Vratislavice and the neighboring town of Jablonec nad Nisou. Therefore, the total area with suburbs encompasses 150,000 inhabitants. Liberec itself has about 105,000 inhabitants. That makes Liberec the third-largest city in Bohemia after Prague and Plzeň.

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