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 population of the city is about 430,000; however, it is estimated to be more than 660,000 - approximately 150% of the official figures. It is one of the smaller capitals of Europe but still the country's largest city. 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 national capital that borders two sovereign states.The city's history has been influenced 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 center 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 has been home to many Hungarian, German and Slovak historical figures. Today 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 ranked as the third richest region of the European Union by GDP (PPP) per capita (after Hamburg and Luxembourg City). GDP at purchasing power parity is about three times higher than in other Slovak regions. Bratislava receives around 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