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10 Cards in this Set
- Front
- Back
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nuclear fission
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The process by which a large nucleus is split into two smaller nucleai.
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nuclear fusion
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The process by which two or more small nuclei fuse to make a bigger nucleus.
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critical mass
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The amount of isotope necessary to cause a chain reaction.
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star magnitude
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The brightness of a star on a scale of -8 to +17. The smaller the number, the brighter the star.
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light year
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The distance light travels in one year.
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galaxy
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A massice ensemble of hundreds of millions of stars, all interacting through the gravitational force, orbiting around a common center.
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radiative zone
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Where the energy photons exert into the next level of the sun.
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convection zone
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The area where the energy photons are absorbed by gases.
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chain reaction
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When the fission process starts to grow rapidly.
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spectral lines
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Wavelengths of light emitted by elements when they are excited.
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