Animal That Eats Planets
The animal I envision is very protective over its planet. It goes out into space and eats anything that gets close to it. To do this, the animal can float through space, and leave/re-enter the atmosphere without any trouble.
Could such an animal live off of eating any rocks or planets in space? Is any of this theoretically possible?
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1 answer
So having the toughest skin would allow for reentry. Getting out of the atmosphere and moving through space is another matter, but this is your creature in your world that you are building. If you want it to eat rocks then have it eat rocks.
Skies the limits when you are making all the rules. Just make the rules consistent and it'll be fine. If the creature all the sudden starts shooting rainbows out of it's butt for no good reason then that would possibly ruin it for some people.
If you want it to be hard science then you'll have to put a lot more thought into it, but for other stuff as long as you make it entertaining and plausible and don't draw attention to some of the wilder elements then most people will just suspend disbelief and go along with it.
If you want more advice on how to do some of those things (space propulsion, leaving the planet, etc) then make a new question focusing on one aspect of the problem with your rules written out. Overly broad questions usually get closed.
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