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The planet will take a long time to cool down, after which its atmospheric composition and other parameters may have changed. When an object of near-planetary mass or more collides with a rocky planet, the force of the impact will melt the planet's surface, turning it into a hot ball of molten rock and iron and vaporizing the planet's surface liquids. Note that there may be configurations of planet pairs you can think of where you may require more than one of the three points above to be true. Im using Sirius as the star and Mars is within. planets that consist of more Hydrogen and less Iron. I just have a quick question for you how can I make Mars habitable Ive been building a star system and Im finding it difficult to introduce liquid water and raise the planets temperature without it super heating and just burning away into nothing. Have one planet be (far) more massive than the other.If you want to start the objects far apart, you can put both planets in an intersecting orbit around a star to reduce the relative impact velocity to some degree.
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Don't launch at 10 km/s, try 0.1 km/s instead. Make sure that the relative velocity between the two objects is low.If you want to merge two planets into one, then these things will help: However, if you add a much smaller star to a larger one, they will merge together. What happens when two objects collide in Universe Sandbox depends on various properties of these objects.įor example: If you try to collide two high-mass stars, the result is often a supernova.