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Explores the fundamental problem of distance in astronomy and discusses various methods for distance measurement, including wide-angle astrometry and detached eclipsing binary distances.
Covers gravitational lensing in astrophysics, including deflection angle, Einstein radius, lens solution, and its application to galaxies and the universe.
Explores the importance of the perfect fluid in cosmology and its coupling to gravity, leading to a discussion on the Einstein universe and static gravity.
