News for hackers. Stuff that matters.

A comment on Do we really travel through time with the speed of light?. Parent comment

Re:Do we really travel through time with the speed of light? by Chilinot on Monday August 31, 2020 @04:13AM (#24329402)
The speed of light is just the speed of any particle without matter. We just use "speed of light" since its simpler to understand and talk about rather than saying "speed of matter-less particles".

The speed of sound is the speed of air-molecules bouncing into each other (~300m/s). Since air-molecules have matter, they dont travel at the speed of light.

[ Parent | on HN ]
Re:Do we really travel through time with the speed of light? by bbojan on Monday August 31, 2020 @06:01AM (#24329884)
To be pedantic, a particle without mass. Matter also includes things without substance like physical fields. So a photon is matter.

At least this is what I was taught in school many years ago...

[ Parent | on HN ]
Re:Do we really travel through time with the speed of light? by davrosthedalek on Monday August 31, 2020 @08:01AM (#24330540)
To be pedantic, a particle without rest-mass...
[ Parent | on HN ]
Re:Do we really travel through time with the speed of light? by Chilinot on Monday August 31, 2020 @08:22AM (#24330693)
Yes, that was a typo on my part.
[ Parent | on HN ]