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If a celestial object appears blue shifted, what can we say about it? Is it approaching us or moving away, and how do you know?
If a celestial object appears "blue shifted," what can we say about it? Is it approaching us or moving away, and how do you know?
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A Concise Introduction to Logic
Authors: Patrick J. Hurley, Lori Watson
13th edition
1305958098, 978-1305958098
