The discoveries of the white dwarf, the neutron star, and the black hole, coming well after the discovery of
the red giant are among eh most exciting developments in decades because they may be well present
physicists with their greatest challenge since the failure of classical mechanics. In the life cycle of the star,
after all of the hydrogen and helium fuel has been burned, the delicate balance between the outer nuclear
radiation. Pressure and the stable gravitational force becomes disturbed and slow contraction begins. As
compression increases, a very dense plasma forms. If the initial star had mass of less than 1.4 solar
masses (1.4 times the mass of our sun), the process ceases at the density of 1,000 tons per cubic inch,
and the star becomes the white dwarf. However, if the star was originally more massive, the white dwarf
plasma can't resist the gravitations pressures, and in rapid collapse, all nuclei of the star are converted to a
gas of free neutrons. Gravitational attraction compresses this neutron gas rapidly until a density of 10 tons
per cubic inch is reached; at this point the strong nuclear force resists further contraction. If the mass of the
star was between 1.4 and a few solar masses, the process stops here, and we have a neutron star. But if
the original star was more massive than a few solar masses, even the strong nuclear forces cannot resist
the gravitational brunch. The neutrons are forced into one another to form heavier hadrons and these in
turn coalesce to form heavier entities, of which we as yet know nothing. At this point, a complete collapse
of the stellar mass occurs; existing theories predict a collapse to infinite density and infinitely small
dimensions Well before this, however, the surface gravitational force would become so strong that no
signal could ever leave the star - any photon emitted would fall back under gravitational attraction and the
star would become black hole in space. This gravitational collapse poses a fundamental challenge to
physics. When the most widely accepted theories predict such improbable things as infinite density and
infinitely small dimensions, it simply means that we are missing some vital insight. This last happened in
physics in the 1930's, when we faced the fundamental paradox concerning atomic structure. At that time, it
was recognized that electrons moved in table orbits about nuclei in atoms. However, it was also recognized
that if charge is accelerated, as it must be to remain in orbit, it radiates energy; so, theoretically, the
electron would be expected eventually to spiral into the nucleus and destroy the atom. Studies centered
around this paradox led to the development of quantum mechanics. It may well be that an equivalent t
advance awaits us in investigating the theoretical problems presented by the phenomenon of gravitational
collapse.
The primary purpose of the passage is to