Larry: You know that term "dark matter" ... it has always perplexed me.
In cosmology, dark matter consists of matter particles that cannot be detected by their emitted radiation but whose presence can be inferred from gravitational effects on visible matter such as stars and galaxies. Estimates of the amount of matter in the galaxies, based on gravitational effects, consistently suggest that there is far more matter than is directly observable. In addition, the existence of dark matter resolves a number of inconsistencies in the Big Bang theory, and is crucial for structure formation.
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