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H
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Habitable Zone:
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A planet on the close to edge of the habitable
zone will have a surface temperature slightly
lower than the hot point of water. A planet
on the distant edge of the habitable zone
will have a surface temperature somewhat higher
than the freezing point of water.
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Heliocentric:
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An adjective sense “centered on the
Sun.”
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Host Galaxy:
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A galaxy in which a space phenomenon, such
as a supernova or even explosion and a gamma-ray
burst that has occurred.
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Hubble Constant (Ho):
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A number that express the rate at which
the space expands with time. Ho appears to
be among 60 and 75 kilometers per second per
mega parsec.
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