Observations of visible matter, the only kind we can see directly, suggest
that most of the universe is, in fact, composed of dark matter. This
conclusion comes mainly from the belief that something unseen (dark
matter) is tugging on visible matter, making it do things the laws of motion
say it should not do. All visible bodies, therefore, seem to be careening
about in a dense cloud of unseen, unknown masses. These might be
dark, Jupiter-sized objects, black holes, and/or some exotic forms of matter.
We must choose between the reality of dark matter or admit that
something is awry with our laws of gravitation and motion when they are
applied on a cosmological scale.
Now, let us examine four dark-matter items from the recent literature:
D. Lin, a University of California astronomer, has shown that the
Large Magellanic Cloud that orbits around our own galaxy (the Milky
Way) us being torn apart (cannibalized) by the powerful gravitational
pull of a dense cloud of dark matter surrounding the Milky Way (see
figure below). This dismemberment of the Large Magellanic Cloud cannot
be explained by the stars in our galaxy that we can see. Lin calculates
that our halo of dark matter is equivalent to 600-800 billion solar masses,
compared to only 100 billion solar masses of visible matter. (Flam, Faye;
Spinning in the Dark, Science, 260:1593, 1993. Also: Anonymous;
'Dark Matter' Is Observed 'Cannibalizing' a Galaxy, Baltimore Sun, p.
8A, June 8, 1993.)
The dark matter surrounding a galaxy will, according to the Theory of
Relativity, act as a gravitational lens that will deflect light rays passing
near it. This dark matter, acting like a telescope, should increase the
number of quasars counted in the sky near galaxy clusters. Such larger
quasar counts are indeed observed, but these increases are much larger
than expected. The implication is that there is much more dark matter in
the universe than previously thought. (Cowen, Ron; Quasar Count
Poses Dark-Matter Puzzle, Science News, 143:397, 1993.)
Finally, dark matter is forcing scientists to re-examine the Equivalence
Principle, which asserts that gravitational mass (as in Newton's
Law of Gravitation) is identical to inertial mass (as in Newton's Force =
Mass X Acceleration). In terrestrial experiments, the two kinds of mass
are equal, but on a cosmological scale, they may not be. There could be a
small (10%), long-range, non-gravitational force exerted between mas
sive objects. (Frieman, Joshua A., and Gradwohl, Ben-Ami; Dark Matter
and the Equivalence Principle, Science, 260:1441, 1993.)
NOTES AND REFERENCES
1
Zeeman et al., 1927. Arkhs. Nederl. Sci., 10, 131-220.
2
An English translation of Gerber's technical paper is presented on
page 61 of The Geocentric Papers, which is available from the Association
for Biblical Astronomy office. (See back cover of this
issue.)
3
Barbour and Bertotti's work is also reprinted in The Geocentric
Papers, p. 88.
4
See Barbour & Bertotti, loc. cit.
5
E. A. Mankinen & D. E. Champion, 1993. Science, 262(5132):412-
416.
6
See Techies' Corner elsewhere in this issue.
7
R. Cowen, 1993. Miranda: Shattering an old image, Science News,
144, p. 300. Reporting from the A.A.S. Div. of Planetary Sciences
meeting, Boulder Colorado.
8
R. Jayawardhana, 1993. The Age Paradox, Astronomy, 21, 39.
9
Bouw, G. D., 1977. The Rotation-Curve of the Virgo Cluster of
Galaxies, Creation Research Society Quarterly, 14, 17-24.
10
The text for this note is taken from William Corliss's Science Frontiers,
No. 89, Sep-Oct 1993, available from the Sourcebook Project,
P.O. Box 107, Glen Arm, MD 21057, U.S.A.