What is the weight of the light emitted from a star during its lifetime?

Question

By stellar classification, please.

hehe. of course i saw my mistake as soon as i read my question on the board... MASS of course is what i'm looking for.

for those stating light has no mass... remember e=mc^2? so what you are saying is that light does not have energy.

Answer 1

Well light has no mass, but the energy to make that light is liberated by converting mass to energy in the nuclear reactions in the core of the star.

Doing the math in the source, assuming I haven't made a mistake, which is maybe not a good assumption since I made many and had to do it over and over to get it right, I calculate the Sun converts about 4 billion tons of mass to energy every second. Assuming its lifetime is about 10 billion years, that adds up to a mass of 1.36E24 tons or about 228 times the mass of the Earth. But that is only 0.07% the mass of the Sun. These numbers are astronomical, you can't get a gut feeling for them. You just have to do the math.

Answer 2

The formula Energy = Mass x Velocity has nothing to do with light.

A definition of light is required to understand your question. Light is composed of photons which have magnetic and electric properties but not mass. The photons are travelling along a wave which has been electrically excited by the source (In this case a star although the same principle applies to a simple flashlight). The photons oscillate along magnetic lines reaching outward from the source. Magnetic lines are created when charged particles are aligned in a single mode.

An electric field is created when there are unbalanced opposite charges. Such is the case with electrons. Every electron is a magnet with a north and south pole.

Magnetic lines of a magnet are constituted of what are called ether magnets (or ether particles). This is the field visible when you sprinkle iron filings around a magnet. These magnetic lines do not travel or have velocity. They align themselves when charged by the source so that the N/S poles of one particle aligns with the N/S pole of the ones ahead of it and behind it etc.

Photons travel on these magnetic lines. The electrons constituting the line (which would technically hold the mass you refer to) does not actually move.

Answer 3

You should have asked how much mass does a star convert to energy during its lifetime.

Answer 4

light emitted by a class M star during its lifetime is as heavy as 4 donkeys on a rice cooker balancing on a 2" ball bearing.

Answer 5

Light has no weight or mass.

Answer 6

Light is massless, so the answer is Zero, for every class of star.

Answer 7

i think light waves hv no weight.......