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Observable Universe:
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The piece of the entire space that could
be seen from Earth.
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Opacity:
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The degree to which light is banned from
passing through an object or a substance.
Opacity is the conflicting of transparency.
As an object’s cloudiness increases,
the amount of light transitory through it
decreases. Glass, for example, is clear and
most clouds are opaque.
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Optical Telescope:
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A telescope, which gathers and magnifies
visible light. The two basic types of visual
telescopes are refracting (using lenses) and
reflecting (using mirrors). The Hubble Space
Telescope is an instance of a reflecting telescope.
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Ozone Layer:
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A region in the higher atmosphere that has
high concentrations of ozone (triatomic oxygen,
03). The ozone layers defend the Earth by
fascinating the Sun’s high-energy ultraviolet
radiation.
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