How to finish distance

Distance could be finished by red shift and blue shift

There would be no longer distance and got finished

z = (λ_observed − λ_emitted) / λ_emitted (red shift) 

S=λ_observed < λ_emitted, so z < 0 (blue shift) 

If these could be done no longer distance could be there

Red shift and blue shift are for measuring distance

Wavelength 1. Light (Visible Spectrum)

A red light has a longer wavelength (~700 nm), while blue light has a shorter wavelength (~450 nm).

Used in optics, fiber communications, and laser technology.

(negative energy density)

craft could effectively "ride" a wave through space, arriving at its destination faster than light would in normal space,

Apparent Superluminal Travel: Because the space ahead contracts and the space behind expands, the distance between two points is effectively shortened, allowing the craft to reach its destination faster than light would through normal space.

Apparent superluminal travel refers to the observation of objects or signals that seem to move faster than the speed of light, without actually violating the principles of relativity.