Imagine you are an evil humanoid alien that wants to destroy Earth (or something awfully similar) for whatever reason. However as an alien, you do not possess any physical weapons. No laser guns. No bombs. Nothing. However you have an advantage. You are an unstoppable and invincible object. No one can slow your movement down and you cannot be killed nor have someone forcefully take you apart or even move the joints of your body (but you can move your own joints).
Now the alien wants to destroy the planet by going through it, through the core and back to the other side (it can be multiple times). However he does not plan to move it out of orbit before it hopefully 'explodes', which will most likely collide with other planets. The exception is if the planet shatters into many pieces around where the planet would normally orbit around its sun and then its remnants hits other planets, it would be fine.
By going through the planet, is it plausible for it to shatter into many pieces? What would actually happen? Especially if you went through it back and forth many times and a high speed.
I imagine that it would have to be pretty violent to prevent its own gravity pulling it back together. What are the limitations and restrictions? Additionally, if possible but not essential, as you begin the destruction of the planet, time should be allowed for people to lift rockets and space planes/ships off before the earth actually falls apart.
Could the alien start going through the planet slowly, and then do it again multiple times faster each time to produce this specific outcome?
Ok so by the looks of it, a small human sized humanoid alien cannot shatter a planet. Would it still destroy the earth's crust if it went through the planet back and forth?