How does a photon emanating from a distant star have enough energy to fly to my eye for millions of kilometers for millions of years?

How does a photon emanating from a distant star have enough energy to fly to my eye for millions of kilometers for millions of years?

A JOURNEY BEYOND THE MILKY WAY

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answers (2)

Answer 1
August, 2021

At school, they seem to be talking about Newton's first law. In order to fly at a constant speed, you do not need to waste energy.

Well, if he encounters something on his way, then he will not reach us.

Answer 2
August, 2021

Why would he miss her? Indeed, when moving, energy is spent only on overcoming the emerging resistance (a consequence of Newton's I law), and in outer space nothing particularly hinders the propagation of light.

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