Infrared Imaging with COAST John Stephen Young St John's College, Cambridge and Cavendish Astrophysics A dissertation submitted for the degree of Doctor of Philosophy in the University of Cambridge 26 March 1999 iii Preface This dissertation describes work carried out in the Astrophysics Group of the Department of Physics, University of Cambridge, between October 1995 and March 1999. Except where explicit reference is made to the work of others, this dissertation is the result of my own work, and includes

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... The Milky Way is 30,000 light years across, about 1000 light years thick, and contains about 1011 stars (1 followed by 11 zeros, ie, 100,000,000,000, or one hundred thousand million stars). ... Life is tough! ... That means that life was well established when the Earth was only 1,000 million years old. ... It tells you that life got started on Earth pretty well as soon as it could! 4,000 million years ago, the Earth had only just solidified, and it was taking a punishing beating from meteorites. ...