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Hace 12 horas · The Danube (/ ˈ d æ n. j uː b / DAN-yoob; known by various names in other languages) is the second-longest river in Europe, after the Volga in Russia.It flows through Central and Southeastern Europe, from the Black Forest south into the Black Sea.A large and historically important river, it was once a frontier of the Roman Empire. In the 21st century, it connects ten European countries ...
Hace 12 horas · Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.Their mass is approximately 13 to 80 times that of Jupiter (M J) —not big enough to sustain nuclear fusion of ordinary hydrogen (1 H) into helium in their cores, but massive enough to emit some light and heat from the fusion of deuterium (2 H).
