Narlikar, J. V.2012-03-062012-03-061988-03-12http://hdl.handle.net/11007/781Starting from the various alternative theoretical interpretations offered for redshifts, this paper describes two models in some detail. The first model belongs to conventional physics and makes use of the Doppler effect. The second model makes use of the variable mass hypothesis arising from the Hoyle-Narlikar theory of gravitation. Some observable consequences of these models and testable predictions are briefly outlined.enNoncosmological redshiftsPhysicsHoyle-Narlikar theory of gravitationDoppler effectArticle