title: Obituary: Fred Lawrence Whipple (1906-2004).
authors.affiliation: Donald K. Yeomans is at the Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.e-mail: donald.k.yeomans@jpl.nasa.gov.
authors.forename: Donald K
authors.initials: DK
authors.lastname: Yeomans
authors.forename: Joseph
authors.initials: J
authors.lastname: Veverka