Why is the speed of light a limit? and why is it just $3×10^8\,\text{m/s}$?
132106
Why does the speed of light $c$ have the value it does?
127383
Speed of light in general relativity
66972
Is there any way to measure the one-way speed of light?
77372
"Speed" of Gravity and Speed of Light
57961
Some doubts about photons
142441
If rest mass does not change with $v$ then why is infinite energy required to accelerate an object to the speed of light?
14036
What is so special about speed of light in vacuum?
103242
Why can't we surpass the speed of light?
69464
Do we know why there is a speed limit in our universe?
91265
Has the speed of light changed over time?
61714
Can One-Way Speed of Light be Instantaneous?
128327
Why does light bend towards the normal when passing from a rarer to a denser medium?
13786
A question in Special Relativity
11053
Planck's Law in terms of wavelength
50289
The vacuum light speed: Is it really constant, i.e., independent of location in space-time?
142906
How can a particle in a medium ever travel faster than light?
106173
What is a "diffraction limit"?