some gravity. Many great minds have mused over
this seemingly simple force that causes all matter
to attract more matter to it-from Copernicus to
Galileo, from Brahe to Kepler, from Newton to Einstein. But
lately there has been a problem with the commonly held theory
of gravity that all observable objects-stars, planets, black holes,
nebulae, etc.-account for only 5% of the theoretically necessary
mass of the universe. The remaining and intangible 95%
(referred to as dark matter) has eluded scientists for decades.
"We are really faced with two untenable possibilities," says
Gregory Bothun, professor of physics at the University of Oregon.
"Either we must believe in dark matter without really understanding anything about it, or we must believe that Newtonian
gravity doesn't work the way we thought it did."
Bothun has made the exploration of this question his work.
If he finds that there is, in fact, no evidence or need for the
existence of dark matter, it would mean rewriting the theory
of one of the most basic and observable forces of nature.
Bothun began teaching at the University of Oregon in 1990,
where he has also served as director of the university's Pine Mountain Observatory. As part of his work at the observatory,
he supervises an educational outreach program to middle and
high school aged students. Using the facilities at the observatory along with the Internet, he allows students to operate the
telescopes at the observatory remotely. Because of these and
other projects, he is considered a leader in integrating technology with teaching. Besides being the author of two textbooks,
Modern Cosmological Observations and Problems (1998) and Cosmology:
Mankind's Grand Investigation, Bothun is the scientific editor
of The Astrophysical Journal. Professor Bothun also has extensive experience in operating space-based interments, including
the Hubble Space Telescope.
Professor Gregory Bothun is Claremont McKenna College's
2000-2001 Phi Beta Kappa Visiting Scholar