When I wasa child, growing up in South America,I often went camping in the wild and hence had direct access to the wondrous Southern sky; the Southern Cross was

I am most grateful to Andr ́ e Heck for his invitation to write a foreword to OSA Volume 4 – I will use this valued opportunity to emphasise those topics in

Astronomy isthemostancientsciencehumanshavepracticedonEarth. Itisascienceofextremesandoflargenumbers:extremesoftime–fromthe big bang to in?nity –, of distan

Emission line stars are attractive to many people because of their spectacular phenomena and their amazing varieties and variability. This book offers general i