“That is that as an object of mass larger than zero approaches the speed of light, its mass increases. As its velocity gets very close to the speed of light, its mass increases dramatically.”
I took an online astrophysics course from Yale. The explanation for the mass increase was fascinating. A planet in orbit has kinetic energy. The faster it goes, the more kinetic energy it has. As you approach relativistic speeds, there is so much kinetic energy that, using e=mc2 we can convert that energy into mass. The number is so high that the mass equivalent is so large, that pushing that much mass to light speed requires so much more energy as to be impossible.
I like the idea in general relativity that time is more or less a point of view. Time speeds up or slows down relative to your speed versus what ever you are observing.
I probably said that poorly. My training was Metaphysics not Physics