cosmogenic /-jenˈik/ adjective

Of an isotope, capable of being produced by the interaction of cosmic rays with the atmosphere or the surface of the Earth

cosmothetˈic or cosmothetˈical adjective

Assuming an external world

cosmic abundance noun

The relative proportion of each atomic element found in the universe

cosmic background radiation see microwave background under microwave

cosmic constant same as cosmological constant (see under cosmology).

cosmic dust noun

Fine particles occurring in interstellar space

cosmic radiation noun

Radiation consisting of cosmic rays

cosmic rays plural noun

Highly penetrating rays from interstellar space, consisting of protons, electrons, positrons, etc

cosmic string noun (astronomy)

Any of the massive hypothetical filaments of matter predicted to be an important component of the very early universe (see also string theory under string)