ar X iv : a st ro - p h / 96 01 03 1 v 1 9 J an 1 99 6 Very close pairs of Quasi - Stellar Objects

ar X iv : a st ro - p h / 96 08 03 6 v 1 8 A ug 1 99 6 TABLE 1 Properties of LMC Double - Mode

ar X iv : a st ro - p h / 96 07 14 6 v 1 2 9 Ju l 1 99 6 An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive Optics

ar X iv : a st ro - p h / 96 08 03 6 v 2 1 2 A ug 1 99 6 TABLE 1 Properties of LMC Double - Mode

ar X iv : a st ro - p h / 96 11 14 3 v 1 1 9 N ov 1 99 6 A high deuterium abundance in the early Universe

ar X iv : a st ro - p h / 96 05 09 9 v 1 1 6 M ay 1 99 6 1 The Age of the Universe CITA - 96 - 9

Globular clusters are the oldest objects in the Galaxy whose age may be accurately determined. As such globular cluster ages provide the best estimate for the age of the universe. The age of a globular cluster is determined by a comparison between theoretical stellar evolution models and observational data. Current uncertainties in the stellar models and age dating process are discussed in deta...