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World building idea: Jupiter-sized Earth
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<blockquote data-quote="Umbran" data-source="post: 8427085" data-attributes="member: 177"><p>Note that several human empires on Earth spanned multiple continents.</p><p></p><p></p><p></p><p>Nitpick: "11 times larger" can mean several things. 11 times the mass, 11 times the radius, 11 times the surface area. I'll assume we are talking Jupiter-sized, so about 120 times the surface area of Earth.</p><p></p><p></p><p></p><p>So, assume humans have a central origin point, and spread out?</p><p></p><p>Humans left Africa in several waves, but we can use the last, largest one as our model - It started maybe 60,000 years ago (there's a question, making for a broad window of when it started), and modern humans had covered Africa, Europe, Asia, and Australia in about 5,000 to 10,000 years.</p><p></p><p>Then, we were stalled. The Pacific and Atlantic oceans were effective barriers. There's a lot of question as to when humans first reached the Americas. However, once we got here, spread was fairly quick, reaching most parts of North and South America within a couple thousand years.</p><p></p><p>So, naive analysis might say, humans can cover an Earth-sized area in about 10K years. However, we note that the real limiter was available paths to new land. </p><p></p><p>One model might be - pick a continent for an origin. Every adjacent landmass will be occupied within 2k to 5k years. And by adjacent we mean, connected by traversable land, or separated by a water barrier of less than 100km. Then, from those land masses, you can move to the next over the next few thousand years, and so on. How far you get depends on how connected the landmasses are.</p></blockquote><p></p>
[QUOTE="Umbran, post: 8427085, member: 177"] Note that several human empires on Earth spanned multiple continents. Nitpick: "11 times larger" can mean several things. 11 times the mass, 11 times the radius, 11 times the surface area. I'll assume we are talking Jupiter-sized, so about 120 times the surface area of Earth. So, assume humans have a central origin point, and spread out? Humans left Africa in several waves, but we can use the last, largest one as our model - It started maybe 60,000 years ago (there's a question, making for a broad window of when it started), and modern humans had covered Africa, Europe, Asia, and Australia in about 5,000 to 10,000 years. Then, we were stalled. The Pacific and Atlantic oceans were effective barriers. There's a lot of question as to when humans first reached the Americas. However, once we got here, spread was fairly quick, reaching most parts of North and South America within a couple thousand years. So, naive analysis might say, humans can cover an Earth-sized area in about 10K years. However, we note that the real limiter was available paths to new land. One model might be - pick a continent for an origin. Every adjacent landmass will be occupied within 2k to 5k years. And by adjacent we mean, connected by traversable land, or separated by a water barrier of less than 100km. Then, from those land masses, you can move to the next over the next few thousand years, and so on. How far you get depends on how connected the landmasses are. [/QUOTE]
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