Is Light Matter and Does It Weigh Anything?

Is light matter or a wave? If it's matter, how can you measure what light weighs? Einstein's theory of relativity simultaneously clarifies and muddies things.
Seven ounces a ray! No, that's a lie. Measuring the weight of light is not as straightforward as that. So what's the more complicated explanation?

Just how much does the Milky Way weigh?

States of Matter - Definition of Solid, Liquid, Gas & Plasma with Videos of States of Matter

What is the mass of the sun?

Mean weight percentage of total unprotected free light (material

Explainer: What are the different states of matter?

How Did We Figure Out Atoms Exist?

How Long Does It Take To Lose Weight

When to Use Light Weights vs. Heavy Weights to Build Strength

Mass versus weight - Wikipedia

What exactly is gravity? - PressReader

Could light theoretically have weight? : r/NoStupidQuestions

Does light have weight? - Quora

How Much Does Light Weigh?💡, E=mc2?, The Truth, Does Light Weigh Anything?Why So Silly-Ep11