what’s is radiation and does everything emit radiation?
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Radiation is a *very* general term. Almost anything that travels outward from a source and carries energy can be considered radiation. Even sound is frequently considered radiation.
Oddballs like gravitational waves and sound aren’t usually talked about categorically as radiation, and are instead referred to specifically. The common types are particle radiation and electromagnetic radiation.
Particle radiation is fastmoving particles like electrons, protons, or even whole atoms. This is ionizing and can break molecules, so it is dangerous to humans.
Electromagnetic radiation includes so many different wavelengths, from radio waves to visible light to x-rays. These wavelengths act very differently, but share some similarities since they are fundamentally the same thing. Everything made of atoms generates this radiation as those atoms bounce against one another. This is how thermal cameras work.
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