Aurora vs Eldorado

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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

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El Dorado (pronounced [el doˈɾaðo], English: ; Spanish for "the golden one"), originally El Hombre Dorado ("The Golden Man") or El Rey Dorado ("The Golden King"), was the term used by the Spanish Empire to describe a mythical tribal chief (zipa) of the Muisca people, an indigenous people of the Altiplano Cundiboyacense of Colombia, who, as an initiation rite, covered himself with gold dust and submerged in Lake Guatavita. The legends surrounding El Dorado changed over time, as it went from being a man, to a city, to a kingdom, and then finally to an empire. A second location for El Dorado was inferred from rumors, which inspired several unsuccessful expeditions in the late 1500s in search of a city called Manõa on the shores of Lake Parime.

Two of the most famous of these expeditions were led by Sir Walter Raleigh. In pursuit of the legend, Spanish conquistadors and numerous others searched what is today Colombia, Venezuela, and parts of Guyana and northern Brazil, for the city and its fabulous king. In the course of these explorations, much of northern South America, including the Amazon River, was mapped. By the beginning of the 19th century, most people dismissed the existence of the city as a myth.Several literary works have used the name in their titles, sometimes as "El Dorado", and other times as "Eldorado".

Source: Wikipedia