Hyperfine structure
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In atomic physics, hyperfine structure is defined by small shifts in otherwise degenerate electronic energy levels and the resulting splittings in those electronic energy levels of atoms, molecules, a
Hyperfine splitting in ferromagnetic cobalt at 3.5 K, observed by quasielastic neutron scattering.
Pioneer plaque
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The Pioneer plaques are a pair of gold-anodized aluminium plaques that were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft, featuring a pictorial message, in case either Pioneer 10
Hyperfine structure
…considered the hyperfine transition of hydrogen to be a sufficiently universal phenomenon so as to be used as a base unit of time and length on the Pioneer plaque and later Voyager Golden Record. In submillimeter astronomy, heterodyne receivers are widely used in detecting electromagnetic signals from celestial…
The illustration on the Pioneer plaque
The plaque attached to Pioneer 10