Bratislava vs Aurora

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Bratislava (, also US:, Slovak: [ˈbracislaʋa] (listen); Hungarian: Pozsony; German: Pressburg, formerly Preßburg [ˈprɛsbʊrk] (listen)) is the capital and largest city of Slovakia. Officially, the inhabitants of the city is about 430,000; however, it is estimated to be greater than 660,000 - approximately 150% of the official figures. Bratislava is in southwestern Slovakia, occupying both banks of the River Danube and the left bank of the River Morava. Bordering Austria and Hungary, it is the only federal capital that borders two autonomous states.The city's history was affected by people of many nations and religions, including Austrians, Bulgarians, Croats, Czechs, Germans, Hungarians, Jews, Serbs and Slovaks. It was the coronation site and legislative centre and capital of the Kingdom of Hungary from 1536 to 1783, eleven Hungarian kings and eight queens were crowned in St.

Martin's Cathedral, and most Hungarian parliament assemblies were held here from the 17th century until the Hungarian Reform Era, and was home to many Hungarian, German and Slovak historic figures. Now Bratislava is the political, cultural and economic centre of Slovakia. It is the seat of the Slovak president, the parliament and the Slovak Executive. It has several universities, and many museums, theatres, galleries and other cultural and educational institutions. Many of Slovakia's large businesses and financial institutions have headquarters there. In 2017, Bratislava was rated as the third wealthiest region of the European Union by GDP (PPP) per capita (after Hamburg and Luxembourg City). GDP at purchasing power parity is about three times greater than in other Slovak regions. Bratislava receives approximately 1 million tourists every year.

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