>>13399847Wellll ... sound waves of course is interpreted as a certain frequency range (that of the average human's hearing). Light of different colours has different frequencies.
The speed of light is easy; it is c by definition ... in a vacuum. And yes, that's the e = m c^2 c. And YES, gravitational lensing is a thing.
Light is affected by a medium it travels through. But as c is a very big number indeed, ignore that, just stick with c.
Light does not NEED a medium to travel through. Sound does; scifi movies and tv series that have explosion sounds in space lie. Light + vacuum; top speed. Sound + vacuum; zilch. Nada. Silence.
