Water
@1970
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When the hydrogen fuel for the fusion reaction runs out, the star turns to helium for a fuel source, burning it into an even heavier mix of carbon, nitrogen and oxygen. Eventually, the helium will also be exhausted, and the star dies, puffing off its outer gaseous layers and leaving behind the tiny, hot, dense core, called a white dwarf. The white dwarf is about the size of Earth, but has a mass very close to that of the original star; in fact, a teaspoon of a white dwarf would weigh as much as a few elephants!
The glow from planetary nebulae is particularly intriguing as it appears surprisingly similar across a broad swath of the spectrum, from ultraviolet to infrared. The Helix remains recognizable at any of these wavelengths, but the combination shown here highlights some subtle differences. 0 reply
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The Republic of the Congo (RC) is located in the western part of Central Africa, on both sides of the equator. It borders on Gabon in the west (border length is 1903 km), on Cameroon (523 km) and the Central African Republic (467 km) in the north, on the DRC (2410 km) in the southeast, and on Angola (Cabinda Province) in the south. The area of the territory is 342,000 km2. The highest point is Mount Berungu, 903 m. In the southwest it is washed by the Atlantic Ocean. The coastline is 170 km long. In addition to the Congo River, the second in the world in terms of water discharge after the Amazon, the country has more than 30 more rivers: Kouilou, Niari, Bouenza, Alima, Sanga, Liuala, Ngoko. Since the end of the 19th century, it has been a colony of France. It gained independence on August 15, 1960. From 1970 to 1991 – People's Republic of the Congo. 0 reply
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