Sinton, William M. (1925–2004)
Harvard astronomer whose spectroscopic
studies of Mars in 1956 and 1958 appeared to
support the hypothesis of Martian plant life.1, 2, 3, 4 From
infrared measurements made using a photoconductive
cell, cooled by liquid nitrogen to make it more sensitive, he reported strong
absorption bands in the spectrum of the
dark areas of Mars which he interpreted as being due to organic compounds,
and in particular the presence of plants. Although his results led to much
excitement, they were also controversial and open to interpretation. In
1963 an alternative explanation was put forward in terms of compounds in
the Earth's atmosphere,3 and by 1965 Sinton himself agreed that
two of his observed bands were caused by terrestrial atmospheric 'deuterated'
water (HDO).4 Another strong proponent of plant life on the surface
of Mars was the Soviet astronomer Gavriil Tikov.
For more on this subject and the present-day controversy surrounding it,
see Mars, vegetation.
Having received his AB and Ph.D. from John Hopkins University, Sinton served
at the Harvard College Observatory and later at the Smithsonian Astrophysical
Observatory, the Lowell Observatory, and finally as professor of physics
and astronomy at the University of Hawaii. His most recent posts have included
scientist in charge of Mauna Kea Observatory and co-organizer of International
Jupiter Watch. After contracting amyotrophic lateral sclerosis (Lou Gehrig's
disease), Sinton dedicated the rest of his life to motivating others who
are severely handicapped and published an autobiography, I Choose to
- Sinton, W. M. "Spectroscopic evidence of vegetation on Mars," Astrophysical
Journal, 126, 231 (1957).
- Sinton, W. M. "Spectroscopic evidence of vegetation on Mars," Pub.
Astron. Soc. Pacific, 70, 50 (1958).
- Sinton, W. M. "Further evidence of vegetation on Mars," Science,
130, 1234 (1959).
- Sinton, W. M. "Further evidence of vegetation on Mars," Lowell
Obs. Bull., 4, 252 (1959).
- Rea, D. G., Belsky, T., and Calvin, M. "Interpretation of the 3- to
4-Micron Infrared Spectrum of Mars," Science, 141, 923
- Rea, D. G., O'Leary, B. T., and Sinto, W. M. "The Origin of the 3.58-
and 3.69-Micron Minima in the Infrared Spectrum," Science, 147,
- Sinton, William M. I Choose To Live. Banbury Publishing (2002).