classic papers of the week -- 102

Symmetries of baryons and mesons

• Murray Gell-Mann (California Institute of Technology, Pasadena, CA)

Gravitational Collapse: The Role of General Relativity

• R. Penrose (Department of Mathematics, Birkbeck College - London)

The Origin of the Moon

• Cameron, A. G. W.; Ward, W. R. (Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, MA)

Satellite-sized planetesimals and lunar origin

• Hartmann, W. K.; Davis, D. R. (Planetary Science Institute, Tucson, AZ)