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General astronomy
Industry: Astronomy
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General astronomy
half-life
Astronomy; General astronomy
the time required for one-half of a radioactive material to decay to a more stable material (it is NOT one-half the age of the rock!).
heliocentric
Astronomy; General astronomy
(universe): model of the universe with the Sun at the center and all other objects moving around it.
helioseismology
Astronomy; General astronomy
the study of the Sun's interior from observations of the Sun's pulsations on its surface.
helium flash
Astronomy; General astronomy
in low-mass red giant stars, the onset of the fusing of helium in the core can be very rapid, almost explosive.
Hertzsprung-Russell diagram (H-R diagram)
Astronomy; General astronomy
a plot of stellar luminosity vs. temperature invented by two astronomers, Hertzsprung and Russell. High temperatures are on the left side and decrease to the right. Low luminosities are on the bottom ...
homogeneous
Astronomy; General astronomy
everywhere uniform in appearance so that there is no preferred observing position.
Hubble constant
Astronomy; General astronomy
slope of the line relating the speed of the galaxies away from each other and their distance apart from each other.
