If I keep walking towards the sun, I feel hotter and hotter, and getting closer to the sun... | Answer: That is an illusion

There is no such things you walking out of the Earth. The map its not flat out...its a cylinder round, you are populated on the speice survival on the surface of the Crust, to breath oxygen. 

You don't get out of the sphere to live on black matter. You don't fall out of the gravity to say vaccum floating.

You certainly don't meets the lines where the Heave and the Earth meets, anything to do the nature of the Temperature, those you die before you leave the Earth.

There is no Iron man, double distant than that....you already dead.