Astronomers have tried to reconstruct how [the universe's] structure evolved, based on the assumption…of unseen cold dark matter and random overdensities acting as seeds (New York Times).
Useful english dictionary. 2012.
o|ver|den|si|ty — «OH vuhr DEHN suh tee», noun, plural. overdensities. an area with a greater than average concentration of matter, often dark matter: »Astronomers have tried to reconstruct how [the universe s] structure evolved, based on the assumption…of unseen… … Useful english dictionary
Cosmic microwave background radiation — CMB and Cosmic background radiation redirect here. For other uses see CMB (disambiguation) and Cosmic background (disambiguation). Physical cosmology … Wikipedia
Galaxy groups and clusters — are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation.[1] They form the densest part of the large scale structure of the universe. In models for the gravitational formation of… … Wikipedia
Solar cycle — The solar cycle, or the solar magnetic activity cycle, is the main source of periodic variation of all solar phenomena driving variations in space weather. [ [http://www7.nationalacademies.org/ssb/SSB Space weather97.pdf Space Weather: A Research … Wikipedia
Scalar Field Dark Matter — In astrophysics Scalar Field Dark Matter is a classical, minimally coupled, real scalar field postulated to account for the inferred dark matter. The mass parameter of the scalar field is determined by the cut off in the power spectrum at small… … Wikipedia
Structure formation — refers to a fundamental problem in physical cosmology. The universe, as is now known from observations of the cosmic microwave background radiation, began in a hot, dense, nearly uniform state approximately 13.7 Gyr ago. [cite journal |author=D.… … Wikipedia
Virgo Stellar Stream — Infobox Galaxy name = Virgo Stellar Stream epoch = J2000 type = remains of a dSph ra = ? dec = ? dist ly = 30 kly appmag v = ? size v = 30 prime; times; 10 prime; constellation name = Virgo radius ly = ? absmag v = ? names = noneThe Virgo Stellar … Wikipedia
Lyman-alpha blob — A Lyman alpha blob (LAB) is a huge concentration of a gas emitting the Lyman alpha emission line. The Lyman alpha emission line is produced by recombination of electrons with ionized hydrogen atoms. LABs are some of the largest known individual… … Wikipedia
