CAMBRIDGE
AT THE UNIVERSITY PRESS
1930
Cambridge University Press
Fetter Lane, London
Bombay, Calcutta, Madras
Toronto
Macmillan
Tokyo
Maruzen Company, Ltd
Copyrighted in the United States of
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The Discovery of Pluto
The two photographs were taken at the Lowell Observatory on the nights of March and 5, 1930. The object indicated by arrows was seen to have moved considerably in the interval, and this proved that it was of planetary character.
The bright object in the bottom left-hand corner is the star 5 Geminorum (see p. 200).
¶ INDEX
- Preface
- Introduction — The Study of Astronomy
- Chapter I — Exploring the Sky
- Chapter II — Exploring the Atom
- Chapter III — Exploring in Time
- Chapter IV — Carving out the Universe
- Chapter V — Stars
- Chapter VI — Beginnings and Endings