What is the fate of photons in the space after emitting from it source?

Question

are photons be converted to matter and attracted by others?

Answer 1

Nope, otherwise they would not reach us from the sun.They travel without change in a straight line. (Though sometimes they appear to go on curved paths, especially through curved space, like around the sun and black holes)

The main reason that nothing happens to them is that at the speed of light, photons do not take any time (in their own estimation) to get to their target.

To elucidate, we on earth watching a rocket ship blast off and eventually get closer and closer to the speed of light would see the pilot look normal at first, then slower and slower as he got faster and faster, by 86% of the speed of light, a clock on his wall would move its second hand once every of our two seconds.

At the speed of light time is stretched infinitely; in other words, stopped, dead frozen.

Light eventually hits something and is absorbed or reflected, but while it is in space it undergoes no change. :)

Hope that explains it.

Answer 2

It's helpful to think of photons as an electromagnetic energy wave rather than a particle, although photons exhibit both properties.

If photons do not encounter any object in space, it's energy will decrease with time and distance, but it will continue as long as there is spacetime to propagate in.