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The Jag
Active - old
Ya the planet would've been habitable if it wasn't hit. -
It's core cooled and it lost it's magnetic field. If it got struck by something, there would be evidence. Take mercury, huge crater on once side and a mountain range created by the kinetic energy on the other side.
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The Jag
Active - old
There is evidence of something hitting it. During its development it got hit by an object about the size of Texas and that shook off its magnetic feels and water.