An Etymological Dictionary of Astronomy and Astrophysics
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A type of highly luminous → blue supergiant star with variable light, first discovered in the M31 and M33 galaxies; also called → S Doradus stars. They are now believed to be part of the class of → Luminous Blue Variable stars.

→ Hubble; Allan Rex Sandage (1926-2010), American cosmologist.

A dimensionless parameter expressed by h(z) = H(z)/H₀, where H(z) is the → Hubble parameter at → redshift z and H₀ is the → Hubble constant.

→ normalized; → Hubble; → parameter.