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02181_Field_light.txt
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1995-11-04
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light: There is no easy way to define
ΓÇ£lightΓÇ¥ scientifically without utilizing
physics. Light can be thought of as
consisting of particles called photons
or as a continuous wave. Because it
acts like both a particle and a wave,
scientists often refer to ΓÇ£the dual
nature of light.ΓÇ¥ Astronomers are
generally most concerned with lightΓÇÖs
wave nature. All parts of the
electromagnetic spectrum can be
referred to as ΓÇ£light,ΓÇ¥ although the
term most often refers to the optical
or visible wavelength portion of the
electromagnetic spectrum.