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History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...
Uruguay ( / ˈjʊərəɡwaɪ / ⓘ [11] YOOR-ə-gwy, Spanish: [uɾuˈɣwaj] ⓘ ), officially the Oriental Republic of Uruguay ( Spanish: República Oriental del Uruguay ), is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the ...