Our Cosmic Glue

In the 1930s it occurred to a bunchof researchers that the stars and planets should have been pulled apart by their own mass. Since gravity alone couldn't keep the galaxies in place, they concluded an invisible substance called "cosmic glue" must be keeping them together. When the atom was split in the 1940s, the cosmic glue was identified as the "strong force," which keeps neutrons and protons happy together.

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