Books take about a year to be published. They will not include the latest studies and research. Textbooks and encyclopedias are good for basic information. Further editions of books demonstrate that a source has been updated to reflect new information and may be a standard source in the field. Are there newer editions available?
A Brief History of Time
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On the revolutions of the heavenly spheres
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The achievement of Galileo
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Dialogue concerning the two chief world systems, Ptolemaic & Copernican
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Galileo's daughter : a historical memoir of science, faith, and love
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Tycho & Kepler : the unlikely partnership that forever changed our understanding of the heavens
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The Georgian star : how William and Caroline Herschel revolutionized our understanding of the cosmos
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Cosmos
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On the shoulders of giants : the great works of physics and astronomy
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Newton's gift : how Sir Isaac Newton unlocked the system of the world
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