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World Charter for Nature
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Cryosurgery
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Chemical graining
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Apollo
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Absolute magnitude
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Water spouting statue
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Permanent virtual circuit
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Common blue
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Plankton
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Rift
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String theory
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Vocal cord
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Annual parallax
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Focal length
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.RAM
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Agglutinin
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Chelicerae
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Spectacled bear
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Summer comfort
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Volcano
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Swallow-hole
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Hertz
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Galvanometer
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Cystectomy
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Riveting
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Mimas
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Oceanic zone
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Ketoacidosis
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API
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Kinase
Spectral line
A spectral line is the signature of atoms of the various elements in the atmosphere of a star. These atoms absorb or emit light at precise wavelengths.
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