![]() Tatoo I and Tatoo II, twin suns of the Tatoo system. With O stars being the biggest in the sequence, the size decreased gradually to the smallest M stars. There were approximately seven hundred million habitable M stars in the galaxy. " M" stars were red and cool, and had a lifespan of approximately one hundred trillion years.There were approximately 3.75 billion habitable K stars in the galaxy. " K" stars were orange and cool, and had a lifespan of sixty billion years.There were approximately two billion habitable G stars in the galaxy. " G" stars were yellow and medium-temperature, and had a lifespan of ten billion years.There were approximately one hundred million habitable F stars in the galaxy. " F" stars were yellow-white and medium-temperature, and had a lifespan of four billion years.There were approximately one hundred million habitable A stars in the galaxy. " A" stars were white and hot, and had a lifespan of four hundred million to two billion years. ![]() There were approximately one hundred million habitable B stars in the galaxy. " B" stars were white-blue and hot, and had a lifespan of ten million years.There were approximately one hundred million habitable O stars in the galaxy. " O" stars were blue and hot, and had a lifespan of less than one million years.There were seven types of main sequence stars in the galaxy: " Traveling through hyperspace ain't like dusting crops, boy! Without precise calculations we could fly right through a star or bounce too close to a supernova, and that'd end your trip real quick, wouldn't it?" ―Han Solo, to Luke Skywalker Red dwarfs accounted for approximately 70 percent of the galaxy's stars. This means that many systems contained two or more stars. There were 7.1 billion habitable stars in the known galaxy, which made up about 3.2 billion habitable star systems. It was estimated that there were four hundred billion stars in the galaxy. An Imperial Class Star Destroyer was undetectable against the background of a first-magnitude star, even with the best instruments. Stars visibility was measured in magnitudes. Most planets were seen orbiting medium mass orange-yellow stars, often called suns. Stars could come in all sorts of sizes, colors, and temperatures. Systems of planets would usually form around stars when the gas and dust around them became stable enough. " There are so many! Do they all have a system of planets?" ―A nine year-old Anakin Skywalker, looking at the stars Ī star was an enormous sphere of immensely hot hydrogen and helium that underwent nuclear fusion to produce heat and light (in essence, it was a giant ball of plasma).
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