An Etymological Dictionary of Astronomy and Astrophysics

The currently most commonly used cosmological model that describes the Universe as a flat infinite space in eternal expansion, accelerated under the effect of a repulsive → dark energy.
The Universe is 13.7 billion years old and made up of 4% baryonic matter, 23% dark matter and
73% dark energy; the Hubble constant is 71 km/s/Mpc and the density of the Universe is very close to the critical value for re-collapse. These values were derived from → WMAP satellite observations of the → cosmic microwave background radiation.

Etymology (EN): M.E. concordaunce, from O.Fr. concordance, from L. concordantia, from → concord + -ance a suffix used to form nouns either from adjectives in -ant or from verbs.

Etymology (PE): Hamsâzgâni, from hamsâz, → concord,

• -gân relation and multiplicity suffix + -i suffix that forms noun from adjectives.