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Space Documentaries 2015 - Alien Planets Science Universe Documentary 2015

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"From an altitude of roughly 39,000 kilometers we had a splendid view of the planet we had come to explore. With an equatorial diameter of 6,563 km, Darwin IV is somewhat smaller than Earth. Its predominant color is dusky ochre, relieved by a sparse mottling of red and two crisply defined polar caps."
―Wayne Barlowe
The fourth planet in the Darwin Binary System, Darwin IV is the homeworld of an impressive diversity of native lifeforms. Once an Earth-like planet with large oceans, Darwin IV was too small to hold its water bodies for a long time: through the eras, it slowly lost its seas. Although Darwin IV is technically considered a desert planet for having little surface water and scarce precipitation, the planet is still thriving with life.
Like its name suggests, Darwin IV is the fourth of six planets orbiting Darwin, an F-class binary star located in the Milky Way Galaxy, 6.5 light years from the Sol System. The two Darwin stars are located so close to each other that they often give the impression of being a single sun when seen from Darwin IV. This fact largely diminishes the odd daylight optical effects commonly found on planets orbiting a binary star. The length of Darwin IV's year is about twice that of Earth. Its day lasts for 26.7 Earth hours. The planet is orbited by at least two small moons.
In some aspects, Darwin IV is similar to the planet Mars. Both are similar in size - Darwin IV being slightly smaller - and are believed to have had large oceans in the past, which eventually evaporated. In both worlds, most of the remaining water is now frozen in the ice caps, which recede and advance with the seasons. Unlike Mars, however, Darwin IV has a dense atmosphere, rich in oxygen and water vapor. The combination of a relatively weak gravity (0.6 of Earth) and an oxygen-rich atmosphere has allowed Darwin IV's native fauna to reach gigantic sizes, including in flying creatures. An interesting fact in Darwin IV's weather is that rain is virtually nonexistent, though there are hurricanes and tropical storms, but they differ from earth's by being spawned from temperature changes rather than large bodies of water.
Most of the surface of Darwin IV is covered by vast plains, especially on the areas which used to be the seafloor. Endless grasslands now dominate these areas, with scarce pocket forests of Plaque-bark Trees growing near the few lakes and rivers left. The planet is almost entirely encircled on the equatorial region by a large mountain range.


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