Atmosphere of Uranus at the solstice of 1986, when "Voyager 2" passed by the planet, they were concentrated near the sunlit pole, making it dark in ultraviolet light. The outermost layer of the Uranian atmosphere, extending for thousands of kilometres, is the thermosphere/exosphere, which has a uniform temperature of around 800 to 850 K. This is much higher than, for instance, the 420 K observed in the thermosphere of Saturn. The heat sources necessary to sustain such high temperatures are not understood, since neither solar FUV/EUV radiation nor auroral activity can provide the necessary energy. The weak cooling efficiency due to the depletion
A Beautiful Planet lemur). The movie also reveals what the burning of the Brazilian rainforest looks like from space. Because rainforests are extremely concentrated biodiversity hotspots, the long plumes of smoke which the astronauts see rising from the Amazon jungle represent the extinction of species that might have led to the development of new pharmaceuticals, economically useful discoveries, or the advancement of scientific knowledge. The burning trees also add greenhouse gases to the atmosphere and curtail the capacity of the forest to reduce carbon dioxide and increase oxygen. Even though "A Beautiful Planet" contains a few dire warnings regarding climate change and environmental