Term

Dark matter

Invisible matter inferred through its gravity: galaxies behave as if they contain more matter than is visible. Its composition remains unknown.

The Edge of Space-Time, Chanda Prescod-Weinstein

Explained in

• The Edge of Space-Time, Chanda Prescod-Weinstein
• Astrophysics for People in a Hurry, Neil deGrasse Tyson

  The name for invisible matter whose pull we measure through the motion of stars and galaxies. By current estimates it makes up about 85 percent of all matter. The effect has been confirmed in many ways, but its nature is still unknown.

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