In terms of emulators, the only Nintendo ones I’ve used are DeSmuME, which is a DS emulator, and Dolphin, which is a GameCube and Wii emulator. Both worked pretty well in my experience and I can’t recall having any particular issues. In terms of ROMs, just search “game name console name ROM” and you should be able to find what you need pretty easily

As others have said, use a VPN when pirating

Correct. Physics gets really, really weird at relativistic speeds. Something to keep in mind is that the speed of light isn’t actually the speed of light itself, but rather the speed of causality - the universe’s hard limit at which any interactions can occur. Even if you are traveling at .99c from a certain reference frame, space time itself warps in such a way that light traveling away from you is still measured at 1c

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Well they certainly don’t fly out of it

In condensed matter physics, a time crystal is a quantum system of particles whose lowest-energy state is one in which the particles are in repetitive motion. The system cannot lose energy to the environment and come to rest because it is already in its quantum ground state. Because of this, the motion of the particles does not really represent kinetic energy like other motion; it has “motion without energy”.