yerkes observatory smaller dome

1897 arch arches architecture astrology astronomy astrophysics attractions background bay beautiful biology bricks building buildings chicago close comet cosmology cosmos county department dome established explore facility field galaxy globe heaven heavens historic historical history isolated landmark lense located moon north northern observatory part planet planets refractor research round science scientists shooting sightseeing smaller space star stars study telescope the tour tourist travel universe university vacation walworth which white wi williams windows wisconsin with world yerkes