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... - *if* the universe contains no matter or antigravity. -> The Hubble "constant". --- A matter-dominated universe would be younger than this. An antigravity-dominated universe would be older than this. (The real universe is a combination of matter and antigravity, with antigravity the dominant compon ...
knowledge quiz - Discovery Education
knowledge quiz - Discovery Education

... from Earth. Which of the following is not a characteristic for classifying stars? A. the star’s luminosity, or brightness B. the star’s color C. the star’s size D. All of these are possible characteristics. 7. Although they did not have telescopes, ancient people studied space. What did they observe ...
Unit8TheUniverse
Unit8TheUniverse

... A. 13-15 b.y.a. the Universe came into being and began to expand at an incredible rate (Inflation). B. Evidence for the Big Bang: The BBT is not designed to explain the origins of the universe only how it developed. 1). Expanding Universe 2). Background radiation that was predicted and later found. ...
Celestial Objects
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... a) red shiftshift- shift toward longer red wavelengths of energy showing that an object is moving AWAY from Earth 1) the farther away the galaxy, the greater the red shift 2) almost all galaxies show a red shiftshiftproof that the universe is expanding (Edwin Hubble was the first to realize this!) ...
P1_Physics_Summary_Topic_3
P1_Physics_Summary_Topic_3

... Keywords: red giant, supernova, white dwarf, black dwarf, fusion reactions, main sequence, neutron star ...
Deep Space and Solar System
Deep Space and Solar System

123mt13a
123mt13a

... The Universe of Aristotle is infinite In the Aristotelian Universe there is no void The observed retrograde motion of Mars Proves Aristotle Wrong The Newtonian universe is infinite The Observed Phases of Venus are expected in the model of Copernicus Tycho successfully detected stellar parallax In th ...
Our Galaxy and the Universe
Our Galaxy and the Universe

... • the galaxy we live in is called the Milky Way. It is 100,000 LY across and contains about 300 billion stars. ...
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Lambda-CDM model



The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard model of Big Bang cosmology, because it is the simplest model that provides a reasonably good account of the following properties of the cosmos: the existence and structure of the cosmic microwave background the large-scale structure in the distribution of galaxies the abundances of hydrogen (including deuterium), helium, and lithium the accelerating expansion of the universe observed in the light from distant galaxies and supernovaeThe model assumes that general relativity is the correct theory of gravity on cosmological scales.It emerged in the late 1990s as a concordance cosmology, after a period of time when disparate observed properties of the universe appeared mutually inconsistent, and there was no consensus on the makeup of the energy density of the universe.The ΛCDM model can be extended by adding cosmological inflation, quintessence and other elements that are current areas of speculation and research in cosmology.Some alternative models challenge the assumptions of the ΛCDM model. Examples of these are modified Newtonian dynamics, modified gravity and theories of large-scale variations in the matter density of the universe.
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