Title: The hunt for Vulcan
Description: "The captivating, all-but-forgotten story of Isaac Newton, Albert Einstein, and the search for a planet that never existed."--Amazon.com.
Subjects: Vulcan (Hypothetical planet), General relativity (Physics), History, Relativity, Astronomy, history, General relativity (physics), Planets
People: Isaac Newton (1643-1727), Albert Einstein (1879-1955)
Time periods: 20th century