Laguna Miscanti is a brackish lake in the Altiplano of the Antofagasta Region in northern Chile. It has an area of about 13 km2 (5 sq mi) and the shape of an arrowhead. The lake has no permanent surface inflows or outflows apart from several springs, and is primarily fed and drained by groundwater. Laguna Miscanti is located among the volcanoes of the Central Andes, and formed through tectonic processes about 22,000 years ago. It was once larger, but the climate became drier again during the Holocene, and the lake shrank and may have dried out completely, leaving wetlands behind. The lake reformed 3,400 years ago and has persisted since. Laguna Miscanti is an important breeding site for birds and a major tourist destination within the Los Flamencos National Reserve. Prehistoric peoples used the area as a hunting ground, and several archaeological sites have been identified nearby. The smaller Laguna Miñiques lies immediately south, separated from Miscanti by a lava flow. ( Full article... )
September 2 : National Day in Vietnam (1945)
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The atmosphere of Pluto is the layer of gases surrounding the dwarf planet Pluto. It consists mainly of nitrogen, with smaller amounts of methane and carbon monoxide, produced by the sublimation of surface ices. Its surface pressure is about 100,000 times lower than that of Earth's atmosphere, and varies with Pluto's seasons and orbit. The atmosphere contains a multi-layered haze, probably formed from compounds produced when atmospheric gases react under high-energy radiation. Its temperature rises rapidly above the surface before gradually falling at higher altitudes. Pluto's atmosphere was confirmed through a stellar occultation in 1988 and studied at close range by the New Horizons spacecraft during its 2015 flyby. This New Horizons photograph, taken 15 minutes after the spacecraft's closest approach on July 14, 2015, shows more than a dozen layers of haze in Pluto's atmosphere, backlit by the Sun. The surface shows rugged, icy mountains and flat ice plains extending to the horizon. The image was taken from a distance of 11,000 miles (18,000 km) to Pluto; the scene is 780 miles (1,250 km) wide. Photograph credit: NASA / JHUAPL / SwRI Recently featured: |