Cannot touch the obstacles tightly

Hi, I created a rocket but the rocket cannot touch the obstacles tightly. It explodes when the obstacles have a little distance between it. My rocket looks like this:
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It seems the green circle touch the obstacles and then the rocket explodes immediately.

Hi,

Is the big green thing a collider? If so, it might be responsible for the collision. Given that the big sphere is a collider, what is its purpose?

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