Ask Ethan: Is alien space travel limited by the speed of light?
<p>When we speak about the distance to cosmic objects — the distant stars, galaxies, quasars and more — we usually measure them in light-years. This is because of the understanding that any form of matter, regardless of what you do to it or how much kinetic energy you add to it, can only approach, but never reach, a maximum speed limit set by the laws of physics themselves: the speed of light. Only massless entities, things like photons, gluons, and gravitational waves, can actually achieve that maximum speed of 299,792,458 m/s through the fabric of space, while everything else is doomed to travel more slowly, never being able to attain that speed while still obeying the laws of physics.</p>
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