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Message: <blockquote data-quote="Lanefan" data-source="post: 8427628" data-attributes="member: 29398">Weather and climate would be the biggest headaches; and tides if the sun and-or any large moons are close enough.My first major world was a bigger-than-Earth affair and I soon came to realize that the weather would end up balls-nuts crazy a lot of the time compared to what we're used to, simply due to scale and the sheer size of the different climatic zones.  The hot areas, being bigger, would get hotter; the cold areas colder, and the temperate-zone interactions between the two would thus tend to be more violent.Tides are another issue: you'd probably have a much bigger difference between high and low tide levels in many places, again due to scale.The other thing to consider is astronomy.  A bigger world is going to be a heavier world (unless it's hollow), meaning it's going to be farther from its mother star, by extension meaning a typical sun-like star won't do unless you want your world to be too cold for Human inhabitation.  So, you'll need a different star type...and once you've determined that, you're right back to weather again because incoming heat from the sun is what ultimately drives almost all day-to-day weather on the planet (volcanic activity and forest fires cause the rest, a trivial but not-zero amount).</blockquote>