The expansion of the Universe.
Abstract
A static spherically symmetric universe model is proposed to explain observed galactic redshifts and microwave background radiation. According to this model, there is a singularity which continually interacts with the universe. Although the model does not provide a good fit with reference to Einstein's field equations and a plausible equation of state, the approach is useful, since it can indicate that the universe is expanding. This conclusion is not based on a priori assumptions about spacetime geometry. The static spherically symmetric model is applied to show that an observer cannot deduce from the isotropy of the microwave background radiation that the universe is spherically symmetric about him.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 August 1978
 DOI:
 10.1093/mnras/184.3.439
 Bibcode:
 1978MNRAS.184..439E
 Keywords:

 Astronomical Models;
 Cosmology;
 Expansion;
 Universe;
 Background Radiation;
 Black Body Radiation;
 Einstein Equations;
 Galactic Radiation;
 Microwave Emission;
 Red Shift;
 Relativity;
 Singularity (Mathematics);
 Astrophysics;
 Expansion:Universe;
 Universe: Models