Atmosphere of Uranus vast. The number density of atomic hydrogen in the corona falls slowly with the distance from the planet, remaining as high a few hundred atoms per cm at a few radii from Uranus. The effects of this bloated exosphere include a drag on small particles orbiting Uranus, causing a general depletion of dust in the Uranian rings. The infalling dust in turn contaminates the upper atmosphere of the planet. Uranus has a relatively bland appearance, lacking broad colorful bands and large clouds prevalent on Jupiter and Saturn. No discrete features were observed in Uranus's atmosphere before 1986. The most conspicuous
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