Some of the problems of determining the cosmological parameters, H 0, q 0, Ω0, Λ and T 0 are discussed. It is argued that direct physical methods of determining cosmological distances are to be preferred to those which involve the use of ‘standard’ properties of distant objects. Although these are not easy, the realisation of these methods should be a key objective for the astrophysical cosmology of the 21st century.
KeywordsCosmological Constant Radio Source Radio Galaxy Cosmological Parameter Stellar Population
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