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Chapter 30

Across
Stars that have pulsation period between 1 and 100 days; luminosity doubles from dimmest to brightest
Invisible material thought to be made up of a form of subatomic particle that interacts weakly with other matter
Theory that proposes that the universe began as a single point and has been expanding ever since
Starlike, very bright, extremely distant object with emission lines in its spectra
Weak radiation that is left over from the early, hot stages of the Big Bang expansion of the universe
Star in the giant branch of the H-R diagram that pulsates in brightness due to its outer layers expanding and contracting
Stars with pulsation periods ranging from 1.5 hours to 1 day, generally having the same luminosity, regardless of pulsation period length
Spiral regions of alternating density which rotates as a rigid pattern
Down
Stars in the halo and bulge that contain traces of heavy elements
Value (H) used to calculate the rate at which the universe is expanding; measured in kilometers per second per magaparsec
A galaxy's core in which highly energetic objects or activities are located
Stars in the disk and arms that have small amounts of heavy elements
Gigantic threadlike or sheetlike cluster of galaxies that is hundreds of millions of light-years in size
Study of the universe, including its nature, origin, and evolution, based on observation and the use of theoretical models
Very bright, often giant, elliptical galaxy that emits as much energy or more energy in the form of radio wavelengths as it does wavelengths of visible light
Spherical region where globular clusters are located; surrounds the Milky Way's nuclear bulge and disk