How would we see a near-lightspeed object emitting light?

Question

Consider an object travelling near the speed of light relative to us (let it be a spaceship or a star), which is emitting light (consider it monochromatic resulting from a two level electronic transition).Regarding the different relative time in the object itself (since it's travelling at high speeds) and the time of an observer (say in Earth), what would happen to the number of photons that we would see emitted by that object, i.e. **photons/second**, as it increases speed ?I believe that we would see that the object would be emitting less and less photons (per unit time) as its speed increases because the **time for radiative recombination**, i.e. the time **required** to produce a photon, would pass slower. Is this true?***If yes:***It is possible that we may fail to detect matter when we look to the outer space and think that nothing is there? Relating the fact that no radiation detectable from that point and that the relativistic mass is especially high, could it, or why cannot, this be related to dark matter?**Note:** I am NOT referring to change of energy caused by red-shift, I am referring to change of the number of photons per unit time!

Answer 1

I think you are over-thinking this question. I could be wrong, but here is my response.

If an star (and you said it could be a star, so im going with that) happened to be able to move at the speed of light, the star itself, will still produce light. So if the star was moving away from Earth towards say Pluto, we on earth would still see the light of the object because a star illuminates in all directions, so he light will still travel towards us, at its regular speed.