STARS AND GALAXIES
SG-1 Milky Way.
SG-4 Altair.
SG-5 Antares.
SG-2 Star classification.
SG-3 Binary star motion.
SG-6 Units of astronomical measurement.
SG-7 Binary star diagram.
SG-46 VY Canis Majoris scale
SG-47 VY Canis Majoris scale
SG-48 Local Group