Eli5. How its possible for the light to travel constantly with out stop slowing down from the most old galaxies?
In: Physics
It is only our frame of reference that light’ travels constantly without stop’. From the frame of reference of light, no time has elapsed, it arrives instantly, hey presto, relativity. All of its energy is in motion none is in mass.
Gravity or with what energy still move at same speed?
Light is special because it has no mass and always travels at, well, the speed of light. This is one of its fundamental properties due to the laws of physics. You can’t really compare light to say, a spaceship, because it’s just not the same thing.
But almost anything can move long distances in space without slowing down. By default, things continue moving at the same speed they’re already moving unless something acts to slow them. On Earth, everything needs to fight air resistance or water resistance or friction with the ground to keep moving. But in space there’s nothing to bump into (at least it’s very rare to hit something) so if you do nothing, you keep moving.
What would slow it down though?
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