DONALD D. CLAYTON is a recently retired professor of Physics and Astronomy from Clemson University. He received his PhD in Astrophysics from the California Institute of Technology. He and his wife,...lihat lebih banyakDONALD D. CLAYTON is a recently retired professor of Physics and Astronomy from Clemson University. He received his PhD in Astrophysics from the California Institute of Technology. He and his wife, Nancy, a watercolor artist, live in Seneca, South Carolina, where their son graduates this year (2009) from Clemson University.lihat lebih sedikit