I am watching these images from James Webb telescope, and it talks about light that travelled 13 billion years!! And I am wondering then, what in this light is never disintegrating as most thing with time…?
In: 6
Yeah, light keeps on going forever until it hits something.
However, unless it’s an absolutely perfect laser (which is impossible) the light spreads out over time, and since we live in a 3D space, it follows the inverse square law. The further you get away from something, it.gets dimmer by the same factor squared. Ie two identical stars, but one is 3x further away will look 9x dimmer.
Also, since the universe is expanding, light gets redshifted, meaning the wavelength increases, it gets harder and harder to make out objects from lower wavelengths, and then eventually we see the cosmic microwave background, which is an image of what the universe was like right after the big bang.
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