our galaxy
DESCRIPTION
Our Galaxy. Write you address: 16825 Spring Cypress Road Cypress TX, 77429 United States of America Earth, Solar System 2/3 Orion-Cygnus Arm Milky Way, Local Group Virgo Super Cluster Universe. How old is the Milky Way?. Approximately 13.2 Billion years old - PowerPoint PPT PresentationTRANSCRIPT
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Our Galaxy
Write you address: 16825 Spring Cypress Road Cypress TX, 77429 United States of America Earth, Solar System 2/3 Orion-Cygnus Arm Milky Way, Local Group Virgo Super Cluster Universe
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How old is the Milky Way?
Approximately 13.2 Billion years old
Easily seen in Rural areas when the Moon is below the horizon.
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THEORIES: ORIGIN OF THE UNIVERSE
Where are you from?
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Religion teaches men how to go to heaven, not how the heavens
go. ~Galileo Galilee
1630
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Steady State Theory
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Steady State Theory
Universe appears the same throughout all of time.
No end or beginning. New matter is created to fill in the
voids created by expansion.
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Pulsating Theory
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Pulsating Theory
Universe oscillates between expanding and contracting.
Big bangs and big crunches occur repeatedly with this model.
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Big Bang Theory
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Big Bang Theory Georges Lemaitre (1894-
1966) Catholic priest in Vatican
Observatory Independently derived
Friedman’s equation (that describes the universe) and used Einstein's work to show the universe expanded from a single point with primeval atoms in 1927.
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Evidence: Olber’s Paradox
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Evidence: Olber’s Paradox
Heinrich E. M. Olbers 1758-1840 1826: States that the darkness of the
night sky conflicts with the supposition of an infinite and eternal static universe.
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Evidence: Hubble’s Law
In 1929, Edwin Hubble described how galaxies are receding in every direction at velocities proportional to their distance from Earth and each other.
In other words: The universe is expanding
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Hubble’s law: Doppler effect
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Evidence: Hubble’s law
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Evidence: Hubble’s law
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Evidence: Hubble’s Law
Using distance and velocity measurements, we can cacluate how old the universe is. T= d/v
4.4x1017 seconds
Calculate how old the universe is!
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Evidence: Hubble’s Law
4.14x1017 seconds =
approximately 14.6 Billion years
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Evidence: Nucleosynthesis
Creation of new atomic nuclei from pre existing protons and neutrons
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Evidence: CMBR Cosmic Microwave Background
Radiation Thermal radiation filling the observable
universe almost uniformly. Detected with sensitive radio telescopes. Discovered in 1964 by American radio
astronomers Arno Penzias and Robert Wilson.
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