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Description

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The Dura system consists of the two stars Ae Dura and Nas Dura, and 8 planets. Most planets have one or more moons which are large spherical bodies like the planets themselves, or smaller irregular asteroids. Dura 1 has 17 asteroids, Dura 2 has no moons, Asumar (a double planet) has 2 moons apart from its companion Nodelmer, Dura 4 has no moons, Dura 5 has 6 moons and 30 asteroids, Dura 6 has 1 asteroid, Dura 7 has 6 moons and 19 asteroids and Dura 8 has 9 moons and 8 asteroids. In between Dura 4 and Dura 5 lies a belt of many asteroids, the largest having a diameter of 975 km, the smallest ones being just a few kilometers across. Across the orbits of the planets are also a handful of comets which are seen as bright streaks across the night sky. Most of these comets are only visible as they travel near the stars, where they stay for some months before they move away. The planets Asumar, Nodelmer, Dura 5 and Dura 7 have a ring of small particles that orbit around their equator, above their atmospheres. All of the planets move from west to east around the stars in elliptical paths called orbits, which for the planets are almost perfectly circular. The habitability of the planets is mainly determined by the temperature, which is a result of the distance between that planet and the stars. In Dura, the habitable zone lies between 1.1 and 2.05 AU. Most larger objects orbit the stars close to the same flat plane, known as the ecliptic. The smaller an object is, the more it can divert from the ecliptic. This is seen with the asteroids and comets, which can orbit from north to south, or even in the opposing direction to the other bodies: from east to west.
The region before the asteroid belt is known as the inner system. Here temperatures are relatively warm, and icy planets are not seen. Further from the asteroid belt lies the outer system, where temperatures are low enough for ice to form. Most of the planets and moons in the outer system have large amounts of ice on their surface. The smaller bodies are composed mostly of rocks and metals. Their gravitational pull is not enough to keep light gasses around them. The largest planets, which are known as gas giants, have such high gravity that they attract a thick atmosphere consisting of primarily hydrogen and helium. The stars themselves, consuming around 99% of the total mass in the system, are also composed of mainly hydrogen and helium. Their mass is of such extremes that the pressures and temperatures generated in their cores by the immense gravity is enough to fuse hydrogen into helium. This generates the energy we experience as light and other radiation. The Dura system is believed to have formed around 3 billion years ago from the collapse of a large cloud of gas and dust in the Milky Way galaxy. Most of the mass collected in the center, creating the stars. The other mass orbited in a disk known as a protoplanetary disk around the stars. Inside this disk, smaller areas of higher gravity collected material and formed the planets and the other objects. The largest star, Ae Dura, fuses hydrogen the fastest, and thus will burn out before Nas Dura. This will happen around 4 billion years from now. Once the star reaches the end of its life, it will grow in size and become a giant star before shedding its mass and becoming a white dwarf.
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Description

Text on the left:
The Dura system consists of the two stars Ae Dura and Nas Dura, and 8 planets. Most planets have one or more moons which are large spherical bodies like the planets themselves, or smaller irregular asteroids. Dura 1 has 17 asteroids, Dura 2 has no moons, Asumar (a double planet) has 2 moons apart from its companion Nodelmer, Dura 4 has no moons, Dura 5 has 6 moons and 30 asteroids, Dura 6 has 1 asteroid, Dura 7 has 6 moons and 19 asteroids and Dura 8 has 9 moons and 8 asteroids. In between Dura 4 and Dura 5 lies a belt of many asteroids, the largest having a diameter of 975 km, the smallest ones being just a few kilometers across. Across the orbits of the planets are also a handful of comets which are seen as bright streaks across the night sky. Most of these comets are only visible as they travel near the stars, where they stay for some months before they move away. The planets Asumar, Nodelmer, Dura 5 and Dura 7 have a ring of small particles that orbit around their equator, above their atmospheres. All of the planets move from west to east around the stars in elliptical paths called orbits, which for the planets are almost perfectly circular. The habitability of the planets is mainly determined by the temperature, which is a result of the distance between that planet and the stars. In Dura, the habitable zone lies between 1.1 and 2.05 AU. Most larger objects orbit the stars close to the same flat plane, known as the ecliptic. The smaller an object is, the more it can divert from the ecliptic. This is seen with the asteroids and comets, which can orbit from north to south, or even in the opposing direction to the other bodies: from east to west.
The region before the asteroid belt is known as the inner system. Here temperatures are relatively warm, and icy planets are not seen. Further from the asteroid belt lies the outer system, where temperatures are low enough for ice to form. Most of the planets and moons in the outer system have large amounts of ice on their surface. The smaller bodies are composed mostly of rocks and metals. Their gravitational pull is not enough to keep light gasses around them. The largest planets, which are known as gas giants, have such high gravity that they attract a thick atmosphere consisting of primarily hydrogen and helium. The stars themselves, consuming around 99% of the total mass in the system, are also composed of mainly hydrogen and helium. Their mass is of such extremes that the pressures and temperatures generated in their cores by the immense gravity is enough to fuse hydrogen into helium. This generates the energy we experience as light and other radiation. The Dura system is believed to have formed around 3 billion years ago from the collapse of a large cloud of gas and dust in the Milky Way galaxy. Most of the mass collected in the center, creating the stars. The other mass orbited in a disk known as a protoplanetary disk around the stars. Inside this disk, smaller areas of higher gravity collected material and formed the planets and the other objects. The largest star, Ae Dura, fuses hydrogen the fastest, and thus will burn out before Nas Dura. This will happen around 4 billion years from now. Once the star reaches the end of its life, it will grow in size and become a giant star before shedding its mass and becoming a white dwarf.
In the same setting as: www.deviantart.com/jbijlsma/ar…