In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or heat. Matter exists in various states. These include classical everyday phases such as solid, liquid, and gas – for example water exists as ice, liquid water, and gaseous steam – but other states are possible, including plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma. Usually atoms can be imagined as a nucleus of protons and neutrons, and a surrounding "cloud" of orbiting electrons which "take up space".

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Racial disparities can affect brain development in Black children - "In the American Journal of Psychiatry study, Black children showed lower amygdala, hippocampus and gray matter volumes compared with white children."

Cosmic Breakthrough: Accurate New Map of All the Matter in the Universe Released

New map of the universe's matter reveals a possible hole in our understanding of the cosmos

Scientists release newly accurate map of all the matter in the universe

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Scientists Reveal The Most Precise Map of All The Matter in The Universe

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Arrakhis: The tiny satellite aiming to reveal what dark matter is made of

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Active matter theory explains fire-ant group behavior

New Study Suggests Dark Matter May Be Made of Dark Photons

Powerful linear accelerator begins smashing atoms – 2 scientists on the team explain how it could reveal rare forms of matter

Black Hole Violently Tearing Apart a Star Unleashes Rare Luminous Jet of Matter

Sending atomic clocks close to the sun could unlock the secrets of dark matter

Sending atomic clocks close to the sun could unlock the secrets of dark matter

The Milky Way seems to be missing nearly half of its regular matter

A team of astronomers has discovered a stellar explosion rich in oxygen and magnesium. A similar supernova with carbon-oxygen circumstellar matter was first discovered only in 2021. These new types of supernovae can provide new insights into the later stages of life of massive stars.