Summary: The Mass elimination process at the speed of light.

If the mass doesn’t move, the compression of space will form space time curvature into straight line to the center of mass, as shown by green arrows in Figure A.

Figure A

When mass is moving, the curvature in the front of direction is more dense than the rear. The compression of space in the rear fills the left space. This filling is balance with the density of space compression in front of direction (Figure B).

Figure B.

The space that fills left space will fill it in the speed of light. Therefore, if the mass moves close to the speed of light, there will be some delay for the space to fill the left space, then the left space will be filled by the mass. This causes mass become longer as seen in figure C.

Figure C

So, if the mass moves at the speed of light, the space no longer able to fill the left space. The mass will be stretched to elimination.