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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.
Explores the discovery and implications of the Cosmological Microwave Background, including CMB fluctuations, COBE and Planck missions, and cluster detection.
Covers gravitational lensing in astrophysics, including deflection angle, Einstein radius, lens solution, and its application to galaxies and the universe.
