Our Galaxy  Write you address:  16825 Spring Cypress Road  Cypress TX, 77429  United States of America  Earth, Solar System  2/3 Orion-Cygnus.

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Presentation transcript:

Our Galaxy  Write you address:  Spring Cypress Road  Cypress TX,  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  Easily seen in Rural areas when the Moon is below the horizon.

Where are you from?

Religion teaches men how to go to heaven, not how the heavens go. ~Galileo Galilee 1630

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.

Pulsating Theory

 Universe oscillates between expanding and contracting.  Big bangs and big crunches occur repeatedly with this model.

Big Bang Theory

 Georges Lemaitre ( )  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.

Evidence: Olber’s Paradox

 Heinrich E. M. Olbers  1826: States that the darkness of the night sky conflicts with the supposition of an infinite and eternal static universe.

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

Hubble’s law: Doppler effectDoppler effect

Evidence: Hubble’s law

Evidence: Hubble’s Law  Using distance and velocity measurements, we can cacluate how old the universe is.  T= d/v 4.4x10 17 seconds Calculate how old the universe is!

Evidence: Hubble’s Law 4.14x10 17 seconds = approximately 14.6 Billion years

Evidence: Nucleosynthesis  Creation of new atomic nuclei from pre existing protons and neutrons

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.