Eli5. How its possible for the light to travel constantly with out stop slowing down from the most old galaxies?
In: Physics
Because everything travels at 3×10^8 m/s through spacetime. Objects with mass have this ‘velocity’ pointing so they move entirely or mostly in the ‘time’ direction (a stationary object is moving at full speed through time, but not at all through space), while photons and massless particles are heading in the ‘space’ direction (really fast in space, not so fast in time).
Like a ship sailing North at a fixed speed, if it turns to point more Eastwards, its Northwards speed decreases as its Eastwards speed increases, but its overall velocity is unchanged. Here, ‘North/South’ is analgous to moving in time and ‘East/West’ is analogous to moving in space.
This quite nicely captures why space contraction and time dilation occur (though it does ignore all the details). Hopefully ELY5!
Light is the ‘most free’ state of energy. Light goes C. Any other statement is false. Doesn’t matter what your gut says, what the tarot cards say, etc. C is the highest common denominator.
If black holes dont let light escape, how does light not slow to zero….actually just remembered what someone said, and remembered that time does not pass in black holes..I never connected the 2, I figured light is stopped and time does not move. Ya just need the time to stop to keep the light from ecaping….
To disagree with nearly every other answer here.
Light doesn’t travel forever at the same speed, it does in fact slow down.
To support this is I cite the phenomenon known as cosmic background radiation.
That fuzz you can hear on an old TV or radio that isn’t tuned properly is an abundance of radio waves that we can detect.
These radio waves are actually the output from the big bang that had slowed down and lost energy over time. They used to be visible light or other higher energy radiation.
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