Ultrains
Ultrains are a theoretical concept in astrophysics concerning particles that travel faster than the speed of light. The idea of such particles, often referred to as tachyons, emerged from attempts to extend Einstein's theory of special relativity. In this theory, objects with mass are restricted to speeds below the speed of light, as their energy and momentum would become infinite at the speed of light. Ultrains, if they exist, would possess imaginary mass and would always travel at speeds exceeding light.
The concept of ultrains is purely speculative and has not been experimentally verified. If ultrains were to
Despite the lack of evidence, the idea of ultrains continues to be a subject of theoretical interest,