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 | Three Steps to the Universe: From the Sun to Black Holes to the Mystery of Dark Matter by David Garfinkle, Richard Garfinkle Paperback, 274 Pages, Published 2010 ISBN-10: 0-226-28348-8 / 0226283488 ISBN-13: 978-0-226-28348-7 / 9780226283487 If scientists can’t touch the Sun, how do they know what it’s made of? And if we can’t see black holes, how can we be confident they exist? Gravitational physicist David Garfinkle and his brother, science fiction writer Richard Garfinkle, tackle these questions and more in Three Steps to the Univer | |