In the 1930s, it was first noticed that the dynamics of astrophysical objects (galaxies, galaxy clusters and the universe itself) required an invisible and unknown form of mass, known now as dark matter. Strong mass discrepancies in spiral galaxies measured in the 1970s gave new weight to the concept of dark matter and motivated physicists to propose a number of dark matter particle candidates.
In the 1930s, it was first noticed that the dynamics of astrophysical objects (galaxies, galaxy clusters and the universe itself) required an invisible and unknown form of mass, known now as dark matter. Strong mass discrepancies in spiral galaxies measured in the 1970s gave new weight to the concept of dark matter and motivated physicists to propose a number of dark matter particle candidates.
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