A gravitational mirage. Four separate bluish white images of the quasar HE0230-2130 are seen. The two fuzzy reddish objects are the galaxies that cause the mirage. Image taken with the Baade 6.5-m telescope
. (Image courtesy of Professor Scott Burles. Used with permission.)
This is the second course in a two-semester sequence on astrophysics. Topics include galactic dynamics, groups and clusters on galaxies, phenomenological cosmology, Newtonian cosmology, Roberston-Walker models, and galaxy formation.