Notes for chapter

1. Laplace (1835) pp 550-551, author's translation

2. Caroline Herschel's phrase about minding the heavens appears in Herschel (1876) p 77

3. Heilbroner (1953)

4. Information on the Voyager spacecraft is available from a web site maintained by NASA's Jet Propulsion Laboratory: <http://www. jpl.nasa.gov/calendar/voyager1.html>

5. Versions of this story are told in, e.g. Condos (1997) pp 109-110, and Henbest and Couper (1994) p 4

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