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Olber`s Paradox
Olber`s Paradox

... Each shell has the same brightness If you add the light from each you get an infinitely bright sky ...
Where We Were to Where We Are: The History of Astronomy
Where We Were to Where We Are: The History of Astronomy

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... As viewed from Earth. Appears to be a milky band of stars across the sky. ...
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OUR EARTH AND UNIVERSE --- WHERE WE LIVE (by Charles

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24.1 The Study of Light

... dough doubles in size, so does the distance between all the raisins. Those objects located father apart move away from each other more rapidly. ...
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Sample Exam 3

... D) Stars don’t move, so we can’t measure a velocity for them. E) It can be used to find the distances of nearby stars. 22) Observations today suggest that spacetime in our universe is closest to being A) curved with positive curvature. C) curved with neutral curvature. B) curved with negative curvat ...
Time From the Perspective of a Particle Physicist
Time From the Perspective of a Particle Physicist

... • It has been observed (first by Hubble in the 1920’s) that galaxies are moving away from us and that the further away they are the faster they are moving (v=Hd) • Indication that the Universe is expanding, and it has been ever since it was created in the Big Bang about 13 billion years ago • Unders ...
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CK12- Study of Space by the EM Spectrum Student Name: ______

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chapter 28 pages 747-752

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Chapter 30 Study Notes

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Questions for this book (Word format)
Questions for this book (Word format)

... It took astronomers many years to realise that some of the “fuzzy patches” or “nebulae” in the night sky are actually galaxies like the Milky Way. One reason for this was that only some of the objects catalogued as “nebulae” are actually galaxies. List at least three types of nebula which are not ex ...
The History of Meteorology
The History of Meteorology

... • Greeks – ~A.D. 125 Ptolemy – first astronomy textbook • earth is spherical and at center of cosmos & doesn’t move • predicted planetary motion in a GEOCENTRIC cosmos with accuracy • accepted for 1,400 years ...
Hypothesis vs. Theory ~The Big Bang
Hypothesis vs. Theory ~The Big Bang

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1. a) Astronomers use the parallax method to measure

... km/sec. a) What sort of a measurement did I make to determine that speed? I measured the Doppler shift. That is, I measured the shift in the spectrum to longer wavelengths from what was emitted. With our balloons we measured the change in distance with time, but we can’t do that with the real Univer ...
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Spring 2013 Final Exam Study Guide

... 42. Which layer of the sun is considered the surface? 43. Which layer of the sun gives it its color? 44. In which layer of the sun does it produce its energy? 45. What is the process called that produces the Sun’s energy? 46. What gas is used to make the energy in the Sun? 47. What gas is produced w ...
Life2
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notes_chapter1 - Auburn University
notes_chapter1 - Auburn University

How the universe began
How the universe began

... light appears redder than expected because its wavelength is stretched. • Hubble’s results proved that galaxies move away from us. • The galaxies further away have a bigger red shift because they are moving away faster than closer galaxies ...
< 1 ... 40 41 42 43 44 45 >

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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