Does light have a power source?

Question

I understand that when we look at distant stars in the night sky we are looking at light that has taken many years to reach us. But does that light and indeed all light have a power source and if so what is it?

Answer 1

Light is a form of energy therefore it has a source. Light is photons and these photons are a product of reactions taking place in stars along with heat and other by products of nuclear fusion

Answer 2

Cosmology does not have a definition of power in space structure. Therfore the cause of the power, for the motion of light is still not quite exactly understood
We do have a good idea how the possilbe four types of Nuclear fusion in stars takes place to radiate light. There fore the Stars are the Source of radiation power. And that the radiation power peters out as time goes by.
There has not been any actual proof that the speed of light is limited to the one we measured relative to the Earth -Sun System.

Answer 3

The Sun is the star at the centre of our Solar System and its energy in the form of light is the "power source" you mention. The Sun's energy supports almost all life on earth. Moonlight is actually reflected sunlight. Stars other than the Sun give off energy in the form of light too which is why we can see them twinkling in the night sky. Stars would be visible during the day if the Sun were dimmer.

Answer 4

Each photon emitted results in a loss of energy of an excited atom. The atom, then, is the direct power source. How that atom got excited in the first place varies. For stars, it's ultimately thermonuclear fusion in its core, or (if it's a young star) gravitational potential energy converted to heat during star's formation.

As for microwave background radiation, it's from the energy of the Big Bang itself. Present hypothesizing is that this energy release was some sort of a phase transition in a scalar field filling space after the vacuum collapsed from 11 to 4 macroscopic dimensions and then inflated, but that's getting a bit heady.

Answer 5

I would say the sun is the light source, and the sun is it's own self producing power station.

Everything in the universe is always right where it is supposed to be at the right time. I don't know how anyone can believe these things happened by chance from a big bang that would only bring destruction, not life.

Answer 6

Every light you see in the evening sky has a source the same as our sun, nuclear reaction.

Answer 7

We have billions of stars in our solar system and uncountable suns. If a star is illuminated, unless it has it's own source of power like our sun, it is merely the light being reflected off another sun or suns.

Answer 8

Light is electro-magnetic radiation. It has no mass and in a vacuum travels at the speed of light 'c'. Nothing can travel faster than this in the universe. Because it has no mass it does not require any power to get to that speed.

Answer 9

A star is a naturally occurring nuclear fusion reactor. Most of them work by converting hydrogen into helium at a temperature of millions of degrees.
Here on earth, we build fission reactors. They convert uranium or plutonium into an assortment of other stuff at a more manageable temperature of a few thousand degrees. Nuclear waste is a problem because it is a lot of different things, most of which is radioactive.

Answer 10

of course it has asource light is a form of energy and the light you see in the sky is light reflected off distant planets from that planets nearest star(sun)