Space Station >> Space Station Glossary
Space Station Glossary H
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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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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