Chapter 1
constellation One of 88 areas into which the sky has been divided for convenience in referring to the stars or other objects therein.
hypothesis The first step in the traditional formulation of the scientific method; a tentative explanation of a set of facts that is to be tested experimentally or observationally.
light-year The distance that light travels in a year.
scientific method No easy definition is possible, but it has to do with a way of testing and verifying hypotheses.
spectrum (spectra) A display of electromagnetic radiation spread out by wavelength or frequency.
theory A later stage of the traditional form of the scientific method, in which a hypothesis has passed enough of its tests that it is generally accepted.
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