![]() ![]() Unlike Mars, however, Darwin IV has a dense atmosphere, rich in oxygen and water vapor. In both worlds, most of the remaining water is now frozen in the ice caps, which recede and advance with the seasons. 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 some aspects, Darwin IV is similar to the planet Mars. The planet is orbited by at least two small moons. The length of Darwin IV's year is about twice that of Earth. This fact largely diminishes the odd daylight optical effects commonly found on planets orbiting binary stars. 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. 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. ![]()
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