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10 Cards in this Set
- Front
- Back
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Variable stars
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Located in the giant branch of the hertzprung Russell diagram.
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Rr lyrae variable
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Have periods of pulsation between 1.5 hours and 1 day, and on average, they have the same luminosity.
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Cephiad variable
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Have periods of pulsation between 1 and 100 days, and luminosity as much as much as doubles from dimmest-brightest.
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Halo
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Spherical region where globular clusters are located.
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Population 1 star
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In the disk and arms and have small amounts of heavy elements.
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Population 2 star
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Found in halo and bulge and contain even smaller traces of heavy elements.
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Spiral density wave
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Has spiral regions of alternation density, which rotate as a rigid pattern.
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Dark matter
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Thought to be made up of a form subatomic particle that interacts only weakly with other matter.
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Superclusters
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Gigantic formations, hundreds of millions of light years in size.
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Hubble constant
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Measured in kilometres per second per mega parse. H represents the slope of the line.
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