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Nuclear Fusion
Chapt. 34.1-34.3
4
Science
Not Applicable
04/02/2005

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Term
Nuclear Fusion
Definition
the combining of nuclei of light atoms to form heavier nuclei with the release of much energy.
Term
Why do nuclear fusion reactios not occur on the outer layers of stars?
Definition
a star needs extremely high temperatures and densities. These conditions are found only in the core of a star. The outer layer serves as the thermal pressure which controls the rate of the nuclear fusion reactions.
Term
What does the spin rate of a star have to do with whether or not it has a system of planets?
Definition
the star's own magnetic field, tied to a disk of dust around the star could be slowing the rotation. There is a possibility that young planets have already formed in these dust disks and sopped up some of the angular momentum themselves.
Term
In what way is a black hole blacker than black ink?
Definition
the infinite density of the black hole causes such a strong gravitational well that not even light can escape from it.
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