Speed of Light

The speed of light constant 'C' in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light.

Lightspeed is about 670,616,629 mph.

The distance to the stars is measured in Light Years (ly) the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).

informal.

Speed of Light - Speed of Light Constant - Carl Sagan

How Are Galaxies Moving Away Faster Than Light?

Infinite Mass

The closer any massive object gets to moving at the Speed of Light it gains 'infinite Mass', light theoretically is massless.

Interstellar Travel: Approaching Light Speed

Time and length dilation

Special relativity: time dilation and length contraction