well, its… light which is it own thing (the universe is not just made from gasses, liquids and solids… there are, supercritical gasses, plasmas etc too).
In more detail, light is made of particles called photons, that have no charge, have a spin of 1 and move at the speed of light.
They are the force carrying particles for the electromagnetic force (for example, when two negatively charged electrons repel each other this can be described as them exchanging photons)
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358chea24 commented on :
Light travels in straight lines and isn’t a solid, liquid or gas.