Black holes are fundamental to our understanding of modern astrophysics, yet the origin of this concept can be traced back to the writings of England's John Michell and France's Pierre-Simon Laplace in 1784 and 1796 respectively. Both independently postulated the existence of "non-luminous bodies", and while Michell used graphical methods to explain his concept, Laplace published a mathematical 'proof' in 1799.
The field-trip to New. Zealand by John Bolton and Gordon Stanley in 1948 was a crucial step in discovering the nature of discrete radio sources. This paper describes the circumstances surrounding the field-trip and also looks at other investigations in radio astronomy in New Zealand at that time.
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